Friendship (English Wikipedia)

Williams, Keelah E.G.; Krems, Jaimie Arona; Ayers, Jessica D.; Rankin, Ashley M. (January 2022). "Sex differences in friendship preferences". Evolution and Human Behavior. 43 (1): 44–52. Bibcode:2022EHumB..43...44W. doi:10.1016/j.evolhumbehav.2021.09.003. ISSN 1090-5138. S2CID 244009099.
David-Barrett, Tamas; Rotkirch, Anna; Carney, James; Behncke Izquierdo, Isabel; Krems, Jaimie A.; Townley, Dylan; McDaniell, Elinor; Byrne-Smith, Anna; Dunbar, Robin I. M. (2015-03-16). Jiang, Luo-Luo (ed.). "Women Favour Dyadic Relationships, but Men Prefer Clubs: Cross-Cultural Evidence from Social Networking". PLOS ONE. 10 (3) e0118329. Bibcode:2015PLoSO..1018329D. doi:10.1371/journal.pone.0118329. ISSN 1932-6203. PMC 4361571. PMID 25775258.
DeScioli, Peter; Kurzban, Robert (2009-06-03). "The Alliance Hypothesis for Human Friendship". PLOS ONE. 4 (6) e5802. Bibcode:2009PLoSO...4.5802D. doi:10.1371/journal.pone.0005802. ISSN 1932-6203. PMC 2688027. PMID 19492066.
Krems, Jaimie Arona; Williams, Keelah E.G.; Merrie, Laureon A.; Kenrick, Douglas T.; Aktipis, Athena (March 2022). "Sex (similarities and) differences in friendship jealousy". Evolution and Human Behavior. 43 (2): 97–106. Bibcode:2022EHumB..43...97K. doi:10.1016/j.evolhumbehav.2021.11.005. ISSN 1090-5138.
Hemelrijk, Charlotte K.; Luteijn, Madelein (1998-03-23). "Philopatry, male presence and grooming reciprocation among female primates: a comparative perspective". Behavioral Ecology and Sociobiology. 42 (3): 207–215. Bibcode:1998BEcoS..42..207H. doi:10.1007/s002650050432. ISSN 0340-5443. S2CID 43297085.
Connor, Richard; Mann, Janet; Watson-Capps, Jana (2006-06-09). "A Sex-Specific Affiliative Contact Behavior in Indian Ocean Bottlenose Dolphins, Tursiops sp". Ethology. 112 (7): 631–638. Bibcode:2006Ethol.112..631C. doi:10.1111/j.1439-0310.2006.01203.x. ISSN 0179-1613.
Strauss, Eli D.; Holekamp, Kay E. (2019-03-11). "Social alliances improve rank and fitness in convention-based societies". Proceedings of the National Academy of Sciences. 116 (18): 8919–8924. Bibcode:2019PNAS..116.8919S. doi:10.1073/pnas.1810384116. ISSN 0027-8424. PMC 6500164. PMID 30858321.
Cameron, Elissa Z.; Setsaas, Trine H.; Linklater, Wayne L. (2009-08-18). "Social bonds between unrelated females increase reproductive success in feral horses". Proceedings of the National Academy of Sciences. 106 (33): 13850–13853. Bibcode:2009PNAS..10613850C. doi:10.1073/pnas.0900639106. ISSN 0027-8424. PMC 2728983. PMID 19667179.

bbc.co.uk (Global: 11^th place; English: 10^th place)

Harter, Pascale (1 July 2013). "Can we make ourselves happier?". BBC News.

books.google.com (Global: 3^rd place; English: 3^rd place)

Bremner, J. Gavin (2017). An Introduction to Developmental Psychology. John Wiley & Sons. ISBN 978-1-4051-8652-0. Retrieved 26 September 2017.
Zelazo, Philip David (2013). The Oxford Handbook of Developmental Psychology. Vol. 2: Self and Other. OUP US. ISBN 978-0-19-995847-4. Retrieved 26 September 2017.
Schulz, Richard (2006). The Encyclopedia of Aging: Fourth Edition, 2-Volume Set. Springer Publishing Company. ISBN 978-0-8261-4844-5. Retrieved 27 September 2017.
Blieszner, Rosemary; Adams, Rebecca G. (1992). Adult Friendship. Sage. ISBN 978-0-8039-3673-7. Retrieved 27 September 2017.
Nussbaum, Jon F.; Federowicz, Molly; Nussbaum, Paul D. (2010). Brain Health and Optimal Engagement for Older Adults. Editorial Aresta S.C. ISBN 978-84-937440-0-7. Retrieved 27 September 2017.
Burleson, Brant R. (2012). Communication Yearbook 19. Routledge. ISBN 978-0-415-87317-8. Retrieved 27 September 2017.
Harris, Margaret (2002). Developmental Psychology: A Student's Handbook. Taylor & Francis. pp. 320–02. ISBN 978-1-84169-192-3. Retrieved 26 September 2017.^{[clarification needed]}
Campbell, Anne (2013-05-16). A Mind Of Her Own: The evolutionary psychology of women. OUP Oxford. pp. 108–110. ISBN 978-0-19-164701-7.

cambridge.org (Global: 209^th place; English: 151^st place)

Konstan, David (1997). Friendship in the Classical World. Key Themes in Ancient History. Cambridge: Cambridge University Press. p. 2. doi:10.1017/cbo9780511612152. ISBN 978-0-521-45402-5.

doi.org (Global: 2^nd place; English: 2^nd place)

Howes, Carollee (1983). "Patterns of Friendship". Child Development. 54 (4): 1041–1053. doi:10.2307/1129908. ISSN 0009-3920. JSTOR 1129908.
DeJesus, Jasmine M.; Rhodes, Marjorie; Kinzler, Katherine D. (2013-10-07). "Evaluations Versus Expectations: Children's Divergent Beliefs About Resource Distribution". Cognitive Science. 38 (1): 178–193. doi:10.1111/cogs.12093. ISSN 0364-0213. PMID 24117730. S2CID 8358667.
Liberman, Zoe; Shaw, Alex (November 2018). "Secret to friendship: Children make inferences about friendship based on secret sharing". Developmental Psychology. 54 (11): 2139–2151. doi:10.1037/dev0000603. ISSN 1939-0599. PMID 30284884. S2CID 52914199.
Liberman, Zoe; Shaw, Alex (August 2019). "Children use similarity, propinquity, and loyalty to predict which people are friends". Journal of Experimental Child Psychology. 184: 1–17. doi:10.1016/j.jecp.2019.03.002. ISSN 0022-0965. PMID 30974289. S2CID 109941102.
Reisman, John M. (September 1, 1985). "Friendship and its Implications for Mental Health or Social Competence". The Journal of Early Adolescence. 5 (3): 383–91. doi:10.1177/0272431685053010. S2CID 144275803.
Verkuyten, Maykel; Masson, Kees (1996-10-01). "Culture and Gender Differences in the Perception of Friendship by Adolescents". International Journal of Psychology. 31 (5): 207–217. doi:10.1080/002075996401089. ISSN 0020-7594. Archived from the original on 2023-07-26. Retrieved 2023-07-26.
Crosnoe, Robert; Needham, Belinda (2004). "Holism, contextual variability, and the study of friendships in adolescent development". Child Development. 75 (1): 264–279. doi:10.1111/j.1467-8624.2004.00668.x. ISSN 0009-3920. PMID 15015689.
Willis, Amy (November 8, 2011). "Most adults have 'only two close friends'". The Telegraph. London. Archived from the original on 2022-01-11. Retrieved August 11, 2013.
- Brashears, Matthew E. (2011). "Small networks and high isolation? A reexamination of American discussion networks". Social Networks. 33 (4). Elsevier BV: 331–341. doi:10.1016/j.socnet.2011.10.003. ISSN 0378-8733.
- Berndt, Thomas J. (2002). "Friendship Quality and Social Development" (PDF). Current Directions in Psychological Science. 11. American Psychological Society: 7–10. doi:10.1111/1467-8721.00157. S2CID 14785379. Archived (PDF) from the original on 2019-08-18. Retrieved 2016-10-22.
- Carstensen, L.L. (1993). "Motivation for social contact across the life span: A theory of socioemotional selectivity". In Jacobs, J.E. (ed.). Nebraska Symposium on Motivation, 1992: Developmental perspectives on motivation. Lincoln, Neb.: University of Nebraska Press. pp. 209–254.
  - Carstensen, L.L.; Isaacowitz, D.M.; Charles, S.T. (1999). "Taking time seriously: A theory of socioemotional selectivity". American Psychologist. 54 (3): 165–181. doi:10.1037/0003-066X.54.3.165. PMID 10199217.
  - Hall, Jeffrey A. (2019). "How many hours does it take to make a friend?". Journal of Social and Personal Relationships. 36 (4): 1278–1296. doi:10.1177/0265407518761225. ISSN 0265-4075. Retrieved 2026-04-12.
  - Spencer, Liz; Pahl, Ray (2007). Rethinking Friendship: Hidden Solidarities Today. Princeton University Press. p. 59. doi:10.1515/9780691188201. ISBN 978-0-691-18820-1.
  - Dunbar, R.I.M. (January 2018). "The Anatomy of Friendship". Trends in Cognitive Sciences. 22 (1): 32–51. doi:10.1016/j.tics.2017.10.004. ISSN 1364-6613. PMID 29273112. S2CID 31147785.
  - Williams, Keelah E.G.; Krems, Jaimie Arona; Ayers, Jessica D.; Rankin, Ashley M. (January 2022). "Sex differences in friendship preferences". Evolution and Human Behavior. 43 (1): 44–52. Bibcode:2022EHumB..43...44W. doi:10.1016/j.evolhumbehav.2021.09.003. ISSN 1090-5138. S2CID 244009099.
  - Boothby, Erica J.; Cooney, Gus; Sandstrom, Gillian M.; Clark, Margaret S. (2018). "The Liking Gap in Conversations: Do People Like Us More Than We Think?". SAGE Journals. Vol. 29, no. 11. pp. 1742–1756. doi:10.1177/0956797618783714.
    - Ducharme, Jamie (2018-09-17). "People Like You More Than You Think, a New Study Suggests". Time.
    - Wiener, Judith; Schneider, Barry H. (2002). "A multisource exploration of the friendship patterns of children with and without learning disabilities". Journal of Abnormal Child Psychology. 30 (2): 127–41. doi:10.1023/A:1014701215315. PMID 12002394. S2CID 42157217. Archived from the original on 27 September 2018. Retrieved 26 September 2017.
      - Hoza, Betsy (June 7, 2007). "Peer Functioning in Children With ADHD". Journal of Pediatric Psychology. 32 (6): 101–06. doi:10.1016/j.ambp.2006.04.011. PMC 2572031. PMID 17261489.
      - Bauminger, Nirit; Solomon, Marjorie; Aviezer, Anat; Heung, Kelly; Gazit, Lilach; Brown, John; Rogers, Sally J. (3 January 2008). "Children with Autism and Their Friends: A Multidimensional Study of Friendship in High-Functioning Autism Spectrum Disorder". Journal of Abnormal Child Psychology. 36 (2): 135–50. doi:10.1007/s10802-007-9156-x. PMID 18172754. S2CID 35579739.
      - David-Barrett, Tamas; Rotkirch, Anna; Carney, James; Behncke Izquierdo, Isabel; Krems, Jaimie A.; Townley, Dylan; McDaniell, Elinor; Byrne-Smith, Anna; Dunbar, Robin I. M. (2015-03-16). Jiang, Luo-Luo (ed.). "Women Favour Dyadic Relationships, but Men Prefer Clubs: Cross-Cultural Evidence from Social Networking". PLOS ONE. 10 (3) e0118329. Bibcode:2015PLoSO..1018329D. doi:10.1371/journal.pone.0118329. ISSN 1932-6203. PMC 4361571. PMID 25775258.
      - Pearce, Eiluned; Machin, Anna; Dunbar, Robin I. M. (18 October 2020). "Sex Differences in Intimacy Levels in Best Friendships and Romantic Partnerships". Adaptive Human Behavior and Physiology. 7 (1). Springer Science and Business Media LLC: 1–16. doi:10.1007/s40750-020-00155-z. ISSN 2198-7335. S2CID 226358247.
      - Bailey, Michael; Johnston, Drew; Kuchler, Theresa; Kumar, Ayush; Stroebel, Johannes (2025). Cross-Gender Social Ties Around the World (Report). Cambridge, MA: National Bureau of Economic Research. doi:10.3386/w33480.
      - Deresiewicz, William (2007). "Thomas Hardy and the History of Friendship Between the Sexes". The Wordsworth Circle. 38 (1–2): 56–63. doi:10.1086/TWC24043958. ISSN 0043-8006. S2CID 165725516.
      - Doucerain, Marina M.; Ryder, Andrew G.; Amiot, Catherine E. (October 2021). "What Are Friends for in Russia Versus Canada?: An Approach for Documenting Cross-Cultural Differences". Cross-Cultural Research. 55 (4): 382–409. doi:10.1177/10693971211024599. ISSN 1069-3971. S2CID 236265614.
      - Tillmann-Healy, Lisa M. (2003-10-01). "Friendship as Method". Qualitative Inquiry. 9 (5): 729–749. doi:10.1177/1077800403254894. ISSN 1077-8004. S2CID 144256070.
      - Konstan, David (1997). Friendship in the Classical World. Key Themes in Ancient History. Cambridge: Cambridge University Press. p. 2. doi:10.1017/cbo9780511612152. ISBN 978-0-521-45402-5.
      - Lu, Peiqi; Oh, Jeewon; Leahy, Katelin E.; Chopik, William J. (2021). "Friendship Importance Around the World: Links to Cultural Factors, Health, and Well-Being". Frontiers in Psychology. 11. Frontiers Media SA. doi:10.3389/fpsyg.2020.570839. ISSN 1664-1078. PMC 7848226.
      - Trivers, Robert L. (March 1971). "The Evolution of Reciprocal Altruism". The Quarterly Review of Biology. 46 (1): 35–57. doi:10.1086/406755. ISSN 0033-5770.
      - Burkett, Brandy; Cosmides, Leda; Bugental, Daphne (2007). "Jealousy, friendship, and the banker's paradox". PsycEXTRA Dataset. doi:10.1037/e514412014-554.
      - DeScioli, Peter; Kurzban, Robert (2009-06-03). "The Alliance Hypothesis for Human Friendship". PLOS ONE. 4 (6) e5802. Bibcode:2009PLoSO...4.5802D. doi:10.1371/journal.pone.0005802. ISSN 1932-6203. PMC 2688027. PMID 19492066.
      - DeScioli, Peter; Kurzban, Robert; Koch, Elizabeth N.; Liben-Nowell, David (January 2011). "Best Friends". Perspectives on Psychological Science. 6 (1): 6–8. doi:10.1177/1745691610393979. ISSN 1745-6916. PMID 26162107. S2CID 212547.
      - Jorm, Anthony F. (2005). "Social networks and health: it's time for an intervention trial". Journal of Epidemiology and Community Health. 59 (7): 537–538. doi:10.1136/jech.2004.031559. ISSN 0143-005X. PMC 1757066. PMID 15965132.
      - "Friendships play key role in suicidal thoughts of girls, but not boys". EurekAlert!. Ohio State University. January 6, 2004. Retrieved 26 September 2017.
        Bearman, Peter S.; Moody, James (2004). "Suicide and Friendships Among American Adolescents". American Journal of Public Health. 94 (1): 89–95. doi:10.2105/AJPH.94.1.89. PMC 1449832. PMID 14713704.
        Brendgen, M.; Vitaro, F.; Bukowski, W.M.; Dionne, G.; Tremblay, R.E.; Boivin, M. (2013). "Can friends protect genetically vulnerable children from depression?". Development and Psychopathology. 25 (2): 277–89. doi:10.1017/s0954579412001058. PMID 23627944. S2CID 12110401.
        Bukowski, W.M.; Hoza, B.; Boivin, M. (1994). "Measuring friendship quality during pre- and early adolescence: the development and psychometric properties of the friendship qualities scale". Journal of Social and Personal Relationships. 11 (3): 471–84. doi:10.1177/0265407594113011. S2CID 143806076.
        Shen, Chun; Rolls, Edmund T; Xiang, Shitong; Langley, Christelle; Sahakian, Barbara J; Cheng, Wei; Feng, Jianfeng (2023-07-03). Whelan, Robert; Büchel, Christian; Whelan, Robert; Schreuders, Lisa (eds.). "Brain and molecular mechanisms underlying the nonlinear association between close friendships, mental health, and cognition in children". eLife. 12 e84072. doi:10.7554/eLife.84072. ISSN 2050-084X. PMC 10317501. PMID 37399053.
        "Is more always better?". eLife. 2023-07-03. Retrieved 2023-07-03.
        Krems, Jaimie; Williams, Keelah; Kenrick, Douglas; Aktipis, Athena (2020-04-28). "Friendship jealousy: One tool for maintaining friendships in the face of third-party threats?". Journal of Personality and Social Psychology. 120 (4): 977–1012. doi:10.31234/osf.io/wdc2q. PMID 32772531. S2CID 221101011.
        Krems, Jaimie Arona; Williams, Keelah E.G.; Merrie, Laureon A.; Kenrick, Douglas T.; Aktipis, Athena (March 2022). "Sex (similarities and) differences in friendship jealousy". Evolution and Human Behavior. 43 (2): 97–106. Bibcode:2022EHumB..43...97K. doi:10.1016/j.evolhumbehav.2021.11.005. ISSN 1090-5138.
        Hemelrijk, Charlotte K.; Steinhauser, Jutta (2007), "15 Cooperation, Coalition, and Alliances", Handbook of Paleoanthropology, Berlin, Heidelberg: Springer Berlin Heidelberg, pp. 1321–1346, doi:10.1007/978-3-540-33761-4_43, ISBN 978-3-540-32474-4
        Hemelrijk, Charlotte K.; Luteijn, Madelein (1998-03-23). "Philopatry, male presence and grooming reciprocation among female primates: a comparative perspective". Behavioral Ecology and Sociobiology. 42 (3): 207–215. Bibcode:1998BEcoS..42..207H. doi:10.1007/s002650050432. ISSN 0340-5443. S2CID 43297085.
        Shutt, Kathryn; MacLarnon, Ann; Heistermann, Michael; Semple, Stuart (2007-02-27). "Grooming in Barbary macaques: better to give than to receive?". Biology Letters. 3 (3): 231–233. doi:10.1098/rsbl.2007.0052. ISSN 1744-9561. PMC 2464693. PMID 17327200.
        Silk, Joan B. (October 2002). "The Form and Function of Reconciliation in Primates". Annual Review of Anthropology. 31 (1): 21–44. doi:10.1146/annurev.anthro.31.032902.101743. ISSN 0084-6570.
        Zamma, Koichiro (March 2002). "Grooming site preferences determined by lice infection among Japanese macaques in Arashiyama". Primates. 43 (1): 41–49. doi:10.1007/bf02629575. ISSN 0032-8332. PMID 12091746. S2CID 42457072.
        Schino, Gabriele (2006-10-03). "Grooming and agonistic support: a meta-analysis of primate reciprocal altruism". Behavioral Ecology. 18 (1): 115–120. doi:10.1093/beheco/arl045. hdl:10.1093/beheco/arl045. ISSN 1465-7279.
        Connor, Richard C.; Smolker, Rachel; Bejder, Lars (December 2006). "Synchrony, social behaviour and alliance affiliation in Indian Ocean bottlenose dolphins, Tursiops aduncus". Animal Behaviour. 72 (6): 1371–1378. doi:10.1016/j.anbehav.2006.03.014. ISSN 0003-3472. S2CID 4513557.
        Connor, Richard; Mann, Janet; Watson-Capps, Jana (2006-06-09). "A Sex-Specific Affiliative Contact Behavior in Indian Ocean Bottlenose Dolphins, Tursiops sp". Ethology. 112 (7): 631–638. Bibcode:2006Ethol.112..631C. doi:10.1111/j.1439-0310.2006.01203.x. ISSN 0179-1613.
        Strauss, Eli D.; Holekamp, Kay E. (2019-03-11). "Social alliances improve rank and fitness in convention-based societies". Proceedings of the National Academy of Sciences. 116 (18): 8919–8924. Bibcode:2019PNAS..116.8919S. doi:10.1073/pnas.1810384116. ISSN 0027-8424. PMC 6500164. PMID 30858321.
        Cameron, Elissa Z.; Setsaas, Trine H.; Linklater, Wayne L. (2009-08-18). "Social bonds between unrelated females increase reproductive success in feral horses". Proceedings of the National Academy of Sciences. 106 (33): 13850–13853. Bibcode:2009PNAS..10613850C. doi:10.1073/pnas.0900639106. ISSN 0027-8424. PMC 2728983. PMID 19667179.

elifesciences.org (Global: low place; English: low place)

Shen, Chun; Rolls, Edmund T; Xiang, Shitong; Langley, Christelle; Sahakian, Barbara J; Cheng, Wei; Feng, Jianfeng (2023-07-03). Whelan, Robert; Büchel, Christian; Whelan, Robert; Schreuders, Lisa (eds.). "Brain and molecular mechanisms underlying the nonlinear association between close friendships, mental health, and cognition in children". eLife. 12 e84072. doi:10.7554/eLife.84072. ISSN 2050-084X. PMC 10317501. PMID 37399053.
- "Is more always better?". eLife. 2023-07-03. Retrieved 2023-07-03.

elitedaily.com (Global: 6,035^th place; English: 4,509^th place)

Lafata, Alexia (17 Jun 2015). "Your Childhood Friendships Are The Best Friendships You'll Ever Have". Elite Daily. Archived from the original on 10 August 2016. Retrieved 21 June 2016.

eurekalert.org (Global: 3,950^th place; English: 3,383^rd place)

"Friendships play key role in suicidal thoughts of girls, but not boys". EurekAlert!. Ohio State University. January 6, 2004. Retrieved 26 September 2017.
- Bearman, Peter S.; Moody, James (2004). "Suicide and Friendships Among American Adolescents". American Journal of Public Health. 94 (1): 89–95. doi:10.2105/AJPH.94.1.89. PMC 1449832. PMID 14713704.

ghostarchive.org (Global: 64^th place; English: 28^th place)

Willis, Amy (November 8, 2011). "Most adults have 'only two close friends'". The Telegraph. London. Archived from the original on 2022-01-11. Retrieved August 11, 2013.
- Brashears, Matthew E. (2011). "Small networks and high isolation? A reexamination of American discussion networks". Social Networks. 33 (4). Elsevier BV: 331–341. doi:10.1016/j.socnet.2011.10.003. ISSN 0378-8733.

hdl.handle.net (Global: 66^th place; English: 34^th place)

Schino, Gabriele (2006-10-03). "Grooming and agonistic support: a meta-analysis of primate reciprocal altruism". Behavioral Ecology. 18 (1): 115–120. doi:10.1093/beheco/arl045. hdl:10.1093/beheco/arl045. ISSN 1465-7279.

jstor.org (Global: 23^rd place; English: 15^th place)

Howes, Carollee (1983). "Patterns of Friendship". Child Development. 54 (4): 1041–1053. doi:10.2307/1129908. ISSN 0009-3920. JSTOR 1129908.
Cooper, John M. (1977). "Aristotle on the Forms of Friendship". The Review of Metaphysics. 30 (4): 619–648. ISSN 0034-6632. JSTOR 20126987.

monster.com (Global: low place; English: low place)

career-advice.monster.com

Bryant, Susan. "Workplace Friendships: Asset or Liability?". Monster.com. Archived from the original on 2013-01-26. Retrieved October 25, 2012.

ndss.org (Global: low place; English: low place)

"Friendships & Social Relationships". National Down Syndrome Society. Archived from the original on 2023-07-26. Retrieved 2023-07-26.

nih.gov (Global: 5^th place; English: 5^th place)

pubmed.ncbi.nlm.nih.gov

DeJesus, Jasmine M.; Rhodes, Marjorie; Kinzler, Katherine D. (2013-10-07). "Evaluations Versus Expectations: Children's Divergent Beliefs About Resource Distribution". Cognitive Science. 38 (1): 178–193. doi:10.1111/cogs.12093. ISSN 0364-0213. PMID 24117730. S2CID 8358667.
Liberman, Zoe; Shaw, Alex (November 2018). "Secret to friendship: Children make inferences about friendship based on secret sharing". Developmental Psychology. 54 (11): 2139–2151. doi:10.1037/dev0000603. ISSN 1939-0599. PMID 30284884. S2CID 52914199.
Liberman, Zoe; Shaw, Alex (August 2019). "Children use similarity, propinquity, and loyalty to predict which people are friends". Journal of Experimental Child Psychology. 184: 1–17. doi:10.1016/j.jecp.2019.03.002. ISSN 0022-0965. PMID 30974289. S2CID 109941102.
Crosnoe, Robert; Needham, Belinda (2004). "Holism, contextual variability, and the study of friendships in adolescent development". Child Development. 75 (1): 264–279. doi:10.1111/j.1467-8624.2004.00668.x. ISSN 0009-3920. PMID 15015689.
Carstensen, L.L. (1993). "Motivation for social contact across the life span: A theory of socioemotional selectivity". In Jacobs, J.E. (ed.). Nebraska Symposium on Motivation, 1992: Developmental perspectives on motivation. Lincoln, Neb.: University of Nebraska Press. pp. 209–254.
- Carstensen, L.L.; Isaacowitz, D.M.; Charles, S.T. (1999). "Taking time seriously: A theory of socioemotional selectivity". American Psychologist. 54 (3): 165–181. doi:10.1037/0003-066X.54.3.165. PMID 10199217.
- Dunbar, R.I.M. (January 2018). "The Anatomy of Friendship". Trends in Cognitive Sciences. 22 (1): 32–51. doi:10.1016/j.tics.2017.10.004. ISSN 1364-6613. PMID 29273112. S2CID 31147785.
- Wiener, Judith; Schneider, Barry H. (2002). "A multisource exploration of the friendship patterns of children with and without learning disabilities". Journal of Abnormal Child Psychology. 30 (2): 127–41. doi:10.1023/A:1014701215315. PMID 12002394. S2CID 42157217. Archived from the original on 27 September 2018. Retrieved 26 September 2017.
  - Hoza, Betsy (June 7, 2007). "Peer Functioning in Children With ADHD". Journal of Pediatric Psychology. 32 (6): 101–06. doi:10.1016/j.ambp.2006.04.011. PMC 2572031. PMID 17261489.
  - Bauminger, Nirit; Solomon, Marjorie; Aviezer, Anat; Heung, Kelly; Gazit, Lilach; Brown, John; Rogers, Sally J. (3 January 2008). "Children with Autism and Their Friends: A Multidimensional Study of Friendship in High-Functioning Autism Spectrum Disorder". Journal of Abnormal Child Psychology. 36 (2): 135–50. doi:10.1007/s10802-007-9156-x. PMID 18172754. S2CID 35579739.
  - David-Barrett, Tamas; Rotkirch, Anna; Carney, James; Behncke Izquierdo, Isabel; Krems, Jaimie A.; Townley, Dylan; McDaniell, Elinor; Byrne-Smith, Anna; Dunbar, Robin I. M. (2015-03-16). Jiang, Luo-Luo (ed.). "Women Favour Dyadic Relationships, but Men Prefer Clubs: Cross-Cultural Evidence from Social Networking". PLOS ONE. 10 (3) e0118329. Bibcode:2015PLoSO..1018329D. doi:10.1371/journal.pone.0118329. ISSN 1932-6203. PMC 4361571. PMID 25775258.
  - DeScioli, Peter; Kurzban, Robert (2009-06-03). "The Alliance Hypothesis for Human Friendship". PLOS ONE. 4 (6) e5802. Bibcode:2009PLoSO...4.5802D. doi:10.1371/journal.pone.0005802. ISSN 1932-6203. PMC 2688027. PMID 19492066.
  - DeScioli, Peter; Kurzban, Robert; Koch, Elizabeth N.; Liben-Nowell, David (January 2011). "Best Friends". Perspectives on Psychological Science. 6 (1): 6–8. doi:10.1177/1745691610393979. ISSN 1745-6916. PMID 26162107. S2CID 212547.
  - Jorm, Anthony F. (2005). "Social networks and health: it's time for an intervention trial". Journal of Epidemiology and Community Health. 59 (7): 537–538. doi:10.1136/jech.2004.031559. ISSN 0143-005X. PMC 1757066. PMID 15965132.
  - "Friendships play key role in suicidal thoughts of girls, but not boys". EurekAlert!. Ohio State University. January 6, 2004. Retrieved 26 September 2017.
    - Bearman, Peter S.; Moody, James (2004). "Suicide and Friendships Among American Adolescents". American Journal of Public Health. 94 (1): 89–95. doi:10.2105/AJPH.94.1.89. PMC 1449832. PMID 14713704.
    - Brendgen, M.; Vitaro, F.; Bukowski, W.M.; Dionne, G.; Tremblay, R.E.; Boivin, M. (2013). "Can friends protect genetically vulnerable children from depression?". Development and Psychopathology. 25 (2): 277–89. doi:10.1017/s0954579412001058. PMID 23627944. S2CID 12110401.
      - Bukowski, W.M.; Hoza, B.; Boivin, M. (1994). "Measuring friendship quality during pre- and early adolescence: the development and psychometric properties of the friendship qualities scale". Journal of Social and Personal Relationships. 11 (3): 471–84. doi:10.1177/0265407594113011. S2CID 143806076.
      - Shen, Chun; Rolls, Edmund T; Xiang, Shitong; Langley, Christelle; Sahakian, Barbara J; Cheng, Wei; Feng, Jianfeng (2023-07-03). Whelan, Robert; Büchel, Christian; Whelan, Robert; Schreuders, Lisa (eds.). "Brain and molecular mechanisms underlying the nonlinear association between close friendships, mental health, and cognition in children". eLife. 12 e84072. doi:10.7554/eLife.84072. ISSN 2050-084X. PMC 10317501. PMID 37399053.
        "Is more always better?". eLife. 2023-07-03. Retrieved 2023-07-03.
        Krems, Jaimie; Williams, Keelah; Kenrick, Douglas; Aktipis, Athena (2020-04-28). "Friendship jealousy: One tool for maintaining friendships in the face of third-party threats?". Journal of Personality and Social Psychology. 120 (4): 977–1012. doi:10.31234/osf.io/wdc2q. PMID 32772531. S2CID 221101011.
        Shutt, Kathryn; MacLarnon, Ann; Heistermann, Michael; Semple, Stuart (2007-02-27). "Grooming in Barbary macaques: better to give than to receive?". Biology Letters. 3 (3): 231–233. doi:10.1098/rsbl.2007.0052. ISSN 1744-9561. PMC 2464693. PMID 17327200.
        Zamma, Koichiro (March 2002). "Grooming site preferences determined by lice infection among Japanese macaques in Arashiyama". Primates. 43 (1): 41–49. doi:10.1007/bf02629575. ISSN 0032-8332. PMID 12091746. S2CID 42457072.
        Strauss, Eli D.; Holekamp, Kay E. (2019-03-11). "Social alliances improve rank and fitness in convention-based societies". Proceedings of the National Academy of Sciences. 116 (18): 8919–8924. Bibcode:2019PNAS..116.8919S. doi:10.1073/pnas.1810384116. ISSN 0027-8424. PMC 6500164. PMID 30858321.
        Cameron, Elissa Z.; Setsaas, Trine H.; Linklater, Wayne L. (2009-08-18). "Social bonds between unrelated females increase reproductive success in feral horses". Proceedings of the National Academy of Sciences. 106 (33): 13850–13853. Bibcode:2009PNAS..10613850C. doi:10.1073/pnas.0900639106. ISSN 0027-8424. PMC 2728983. PMID 19667179.
        ncbi.nlm.nih.gov
        Wiener, Judith; Schneider, Barry H. (2002). "A multisource exploration of the friendship patterns of children with and without learning disabilities". Journal of Abnormal Child Psychology. 30 (2): 127–41. doi:10.1023/A:1014701215315. PMID 12002394. S2CID 42157217. Archived from the original on 27 September 2018. Retrieved 26 September 2017.
        Hoza, Betsy (June 7, 2007). "Peer Functioning in Children With ADHD". Journal of Pediatric Psychology. 32 (6): 101–06. doi:10.1016/j.ambp.2006.04.011. PMC 2572031. PMID 17261489.
        David-Barrett, Tamas; Rotkirch, Anna; Carney, James; Behncke Izquierdo, Isabel; Krems, Jaimie A.; Townley, Dylan; McDaniell, Elinor; Byrne-Smith, Anna; Dunbar, Robin I. M. (2015-03-16). Jiang, Luo-Luo (ed.). "Women Favour Dyadic Relationships, but Men Prefer Clubs: Cross-Cultural Evidence from Social Networking". PLOS ONE. 10 (3) e0118329. Bibcode:2015PLoSO..1018329D. doi:10.1371/journal.pone.0118329. ISSN 1932-6203. PMC 4361571. PMID 25775258.
        Lu, Peiqi; Oh, Jeewon; Leahy, Katelin E.; Chopik, William J. (2021). "Friendship Importance Around the World: Links to Cultural Factors, Health, and Well-Being". Frontiers in Psychology. 11. Frontiers Media SA. doi:10.3389/fpsyg.2020.570839. ISSN 1664-1078. PMC 7848226.
        DeScioli, Peter; Kurzban, Robert (2009-06-03). "The Alliance Hypothesis for Human Friendship". PLOS ONE. 4 (6) e5802. Bibcode:2009PLoSO...4.5802D. doi:10.1371/journal.pone.0005802. ISSN 1932-6203. PMC 2688027. PMID 19492066.
        Jorm, Anthony F. (2005). "Social networks and health: it's time for an intervention trial". Journal of Epidemiology and Community Health. 59 (7): 537–538. doi:10.1136/jech.2004.031559. ISSN 0143-005X. PMC 1757066. PMID 15965132.
        "Friendships play key role in suicidal thoughts of girls, but not boys". EurekAlert!. Ohio State University. January 6, 2004. Retrieved 26 September 2017.
        Bearman, Peter S.; Moody, James (2004). "Suicide and Friendships Among American Adolescents". American Journal of Public Health. 94 (1): 89–95. doi:10.2105/AJPH.94.1.89. PMC 1449832. PMID 14713704.
        Shen, Chun; Rolls, Edmund T; Xiang, Shitong; Langley, Christelle; Sahakian, Barbara J; Cheng, Wei; Feng, Jianfeng (2023-07-03). Whelan, Robert; Büchel, Christian; Whelan, Robert; Schreuders, Lisa (eds.). "Brain and molecular mechanisms underlying the nonlinear association between close friendships, mental health, and cognition in children". eLife. 12 e84072. doi:10.7554/eLife.84072. ISSN 2050-084X. PMC 10317501. PMID 37399053.
        "Is more always better?". eLife. 2023-07-03. Retrieved 2023-07-03.
        Shutt, Kathryn; MacLarnon, Ann; Heistermann, Michael; Semple, Stuart (2007-02-27). "Grooming in Barbary macaques: better to give than to receive?". Biology Letters. 3 (3): 231–233. doi:10.1098/rsbl.2007.0052. ISSN 1744-9561. PMC 2464693. PMID 17327200.
        Strauss, Eli D.; Holekamp, Kay E. (2019-03-11). "Social alliances improve rank and fitness in convention-based societies". Proceedings of the National Academy of Sciences. 116 (18): 8919–8924. Bibcode:2019PNAS..116.8919S. doi:10.1073/pnas.1810384116. ISSN 0027-8424. PMC 6500164. PMID 30858321.
        Cameron, Elissa Z.; Setsaas, Trine H.; Linklater, Wayne L. (2009-08-18). "Social bonds between unrelated females increase reproductive success in feral horses". Proceedings of the National Academy of Sciences. 106 (33): 13850–13853. Bibcode:2009PNAS..10613850C. doi:10.1073/pnas.0900639106. ISSN 0027-8424. PMC 2728983. PMID 19667179.

nytimes.com (Global: 7^th place; English: 7^th place)

Williams, Alex (13 July 2012). "Friends of a Certain Age: Why Is It Hard To Make Friends Over 30?". The New York Times. Archived from the original on 28 October 2012. Retrieved October 25, 2012.

orangatamariki.govt.nz (Global: low place; English: low place)

practice.orangatamariki.govt.nz

"Friendships — Tuituia domain". practice.orangatamariki.govt.nz. Archived from the original on 2024-01-11. Retrieved 2024-01-11.

oxforddictionaries.com (Global: 1,689^th place; English: 1,562^nd place)

"Definition for friend". Oxford Dictionaries. Oxford Dictionary Press. Archived from the original on January 26, 2011. Retrieved 25 May 2012.

pewresearch.org (Global: 1,516^th place; English: 983^rd place)

Parker, Kim; Minkin, Rachel (2023). "5. What makes for a fulfilling life?". Pew Research Center. Retrieved 2026-08-19.

psychnewsdaily.com (Global: low place; English: low place)

Heingartner, Douglas, ed. (2020-10-20). "Women are more likely than men to say they have a best friend". PsychNewsDaily. Archived from the original on 2020-10-20. Retrieved 2020-10-21.

psychologytoday.com (Global: 2,259^th place; English: 1,691^st place)

Kennedy-Moore, Eileen (2013). "What Friends Teach Children". Psychology Today.
Kennedy-Moore, Eileen (2012). "How children make friends (part 1)". Psychology Today. (part 2) (part3)
Kennedy-Moore, Eileen (26 February 2012). "Children's Growing Friendships". Psychology Today.

purdue.edu (Global: 1,391^st place; English: 979^th place)

news.uns.purdue.edu

Sparks, Glenn (August 7, 2007). "Study shows what makes college buddies lifelong friends". Purdue University News. Archived from the original on 2019-04-07.

www2.psych.purdue.edu

Berndt, Thomas J. (2002). "Friendship Quality and Social Development" (PDF). Current Directions in Psychological Science. 11. American Psychological Society: 7–10. doi:10.1111/1467-8721.00157. S2CID 14785379. Archived (PDF) from the original on 2019-08-18. Retrieved 2016-10-22.

researchgate.net (Global: 96^th place; English: 89^th place)

Wiener, Judith; Schneider, Barry H. (2002). "A multisource exploration of the friendship patterns of children with and without learning disabilities". Journal of Abnormal Child Psychology. 30 (2): 127–41. doi:10.1023/A:1014701215315. PMID 12002394. S2CID 42157217. Archived from the original on 27 September 2018. Retrieved 26 September 2017.
- Hoza, Betsy (June 7, 2007). "Peer Functioning in Children With ADHD". Journal of Pediatric Psychology. 32 (6): 101–06. doi:10.1016/j.ambp.2006.04.011. PMC 2572031. PMID 17261489.

sagepub.com (Global: 609^th place; English: 451^st place)

journals.sagepub.com

Hall, Jeffrey A. (2019). "How many hours does it take to make a friend?". Journal of Social and Personal Relationships. 36 (4): 1278–1296. doi:10.1177/0265407518761225. ISSN 0265-4075. Retrieved 2026-04-12.
Tillmann-Healy, Lisa M. (2003-10-01). "Friendship as Method". Qualitative Inquiry. 9 (5): 729–749. doi:10.1177/1077800403254894. ISSN 1077-8004. S2CID 144256070.

sciencedaily.com (Global: 1,390^th place; English: 1,286^th place)

Reinberg, Steven (2018-09-19). "'Liking Gap' Might Stand in Way of New Friendships". US News. Archived from the original on 2022-09-10. Retrieved 2022-09-10.
- Society for Personality and Social Psychology (2019-02-08). "Bridging the 'liking-gap,' researchers discuss awkwardness of conversations". Science Daily. Archived from the original on 2022-09-10. Retrieved 2022-09-10.

semanticscholar.org (Global: 15^th place; English: 8^th place)

api.semanticscholar.org

DeJesus, Jasmine M.; Rhodes, Marjorie; Kinzler, Katherine D. (2013-10-07). "Evaluations Versus Expectations: Children's Divergent Beliefs About Resource Distribution". Cognitive Science. 38 (1): 178–193. doi:10.1111/cogs.12093. ISSN 0364-0213. PMID 24117730. S2CID 8358667.
Liberman, Zoe; Shaw, Alex (November 2018). "Secret to friendship: Children make inferences about friendship based on secret sharing". Developmental Psychology. 54 (11): 2139–2151. doi:10.1037/dev0000603. ISSN 1939-0599. PMID 30284884. S2CID 52914199.
Liberman, Zoe; Shaw, Alex (August 2019). "Children use similarity, propinquity, and loyalty to predict which people are friends". Journal of Experimental Child Psychology. 184: 1–17. doi:10.1016/j.jecp.2019.03.002. ISSN 0022-0965. PMID 30974289. S2CID 109941102.
Reisman, John M. (September 1, 1985). "Friendship and its Implications for Mental Health or Social Competence". The Journal of Early Adolescence. 5 (3): 383–91. doi:10.1177/0272431685053010. S2CID 144275803.
Berndt, Thomas J. (2002). "Friendship Quality and Social Development" (PDF). Current Directions in Psychological Science. 11. American Psychological Society: 7–10. doi:10.1111/1467-8721.00157. S2CID 14785379. Archived (PDF) from the original on 2019-08-18. Retrieved 2016-10-22.
Dunbar, R.I.M. (January 2018). "The Anatomy of Friendship". Trends in Cognitive Sciences. 22 (1): 32–51. doi:10.1016/j.tics.2017.10.004. ISSN 1364-6613. PMID 29273112. S2CID 31147785.
Williams, Keelah E.G.; Krems, Jaimie Arona; Ayers, Jessica D.; Rankin, Ashley M. (January 2022). "Sex differences in friendship preferences". Evolution and Human Behavior. 43 (1): 44–52. Bibcode:2022EHumB..43...44W. doi:10.1016/j.evolhumbehav.2021.09.003. ISSN 1090-5138. S2CID 244009099.
Wiener, Judith; Schneider, Barry H. (2002). "A multisource exploration of the friendship patterns of children with and without learning disabilities". Journal of Abnormal Child Psychology. 30 (2): 127–41. doi:10.1023/A:1014701215315. PMID 12002394. S2CID 42157217. Archived from the original on 27 September 2018. Retrieved 26 September 2017.
- Hoza, Betsy (June 7, 2007). "Peer Functioning in Children With ADHD". Journal of Pediatric Psychology. 32 (6): 101–06. doi:10.1016/j.ambp.2006.04.011. PMC 2572031. PMID 17261489.
- Bauminger, Nirit; Solomon, Marjorie; Aviezer, Anat; Heung, Kelly; Gazit, Lilach; Brown, John; Rogers, Sally J. (3 January 2008). "Children with Autism and Their Friends: A Multidimensional Study of Friendship in High-Functioning Autism Spectrum Disorder". Journal of Abnormal Child Psychology. 36 (2): 135–50. doi:10.1007/s10802-007-9156-x. PMID 18172754. S2CID 35579739.
- Pearce, Eiluned; Machin, Anna; Dunbar, Robin I. M. (18 October 2020). "Sex Differences in Intimacy Levels in Best Friendships and Romantic Partnerships". Adaptive Human Behavior and Physiology. 7 (1). Springer Science and Business Media LLC: 1–16. doi:10.1007/s40750-020-00155-z. ISSN 2198-7335. S2CID 226358247.
- Deresiewicz, William (2007). "Thomas Hardy and the History of Friendship Between the Sexes". The Wordsworth Circle. 38 (1–2): 56–63. doi:10.1086/TWC24043958. ISSN 0043-8006. S2CID 165725516.
- Doucerain, Marina M.; Ryder, Andrew G.; Amiot, Catherine E. (October 2021). "What Are Friends for in Russia Versus Canada?: An Approach for Documenting Cross-Cultural Differences". Cross-Cultural Research. 55 (4): 382–409. doi:10.1177/10693971211024599. ISSN 1069-3971. S2CID 236265614.
- Tillmann-Healy, Lisa M. (2003-10-01). "Friendship as Method". Qualitative Inquiry. 9 (5): 729–749. doi:10.1177/1077800403254894. ISSN 1077-8004. S2CID 144256070.
- DeScioli, Peter; Kurzban, Robert; Koch, Elizabeth N.; Liben-Nowell, David (January 2011). "Best Friends". Perspectives on Psychological Science. 6 (1): 6–8. doi:10.1177/1745691610393979. ISSN 1745-6916. PMID 26162107. S2CID 212547.
- Brendgen, M.; Vitaro, F.; Bukowski, W.M.; Dionne, G.; Tremblay, R.E.; Boivin, M. (2013). "Can friends protect genetically vulnerable children from depression?". Development and Psychopathology. 25 (2): 277–89. doi:10.1017/s0954579412001058. PMID 23627944. S2CID 12110401.
  - Bukowski, W.M.; Hoza, B.; Boivin, M. (1994). "Measuring friendship quality during pre- and early adolescence: the development and psychometric properties of the friendship qualities scale". Journal of Social and Personal Relationships. 11 (3): 471–84. doi:10.1177/0265407594113011. S2CID 143806076.
  - Krems, Jaimie; Williams, Keelah; Kenrick, Douglas; Aktipis, Athena (2020-04-28). "Friendship jealousy: One tool for maintaining friendships in the face of third-party threats?". Journal of Personality and Social Psychology. 120 (4): 977–1012. doi:10.31234/osf.io/wdc2q. PMID 32772531. S2CID 221101011.
  - Hemelrijk, Charlotte K.; Luteijn, Madelein (1998-03-23). "Philopatry, male presence and grooming reciprocation among female primates: a comparative perspective". Behavioral Ecology and Sociobiology. 42 (3): 207–215. Bibcode:1998BEcoS..42..207H. doi:10.1007/s002650050432. ISSN 0340-5443. S2CID 43297085.
  - Zamma, Koichiro (March 2002). "Grooming site preferences determined by lice infection among Japanese macaques in Arashiyama". Primates. 43 (1): 41–49. doi:10.1007/bf02629575. ISSN 0032-8332. PMID 12091746. S2CID 42457072.
  - Connor, Richard C.; Smolker, Rachel; Bejder, Lars (December 2006). "Synchrony, social behaviour and alliance affiliation in Indian Ocean bottlenose dolphins, Tursiops aduncus". Animal Behaviour. 72 (6): 1371–1378. doi:10.1016/j.anbehav.2006.03.014. ISSN 0003-3472. S2CID 4513557.

springer.com (Global: 182^nd place; English: 172^nd place)

Sias, Patricia; Bartoo, Heidi (2007). "Friendship, Social Support, and Health". In L'Abate, Luciano (ed.). Low-Cost Approaches to Promote Physical and Mental Health: Theory, Research, and Practice. New York: Springer-Verlag. pp. 455–472. ISBN 978-0-387-36898-6. Archived from the original on 2021-06-20. Retrieved 2020-12-23.

telegraph.co.uk (Global: 40^th place; English: 27^th place)

Willis, Amy (November 8, 2011). "Most adults have 'only two close friends'". The Telegraph. London. Archived from the original on 2022-01-11. Retrieved August 11, 2013.
- Brashears, Matthew E. (2011). "Small networks and high isolation? A reexamination of American discussion networks". Social Networks. 33 (4). Elsevier BV: 331–341. doi:10.1016/j.socnet.2011.10.003. ISSN 0378-8733.

theatlantic.com (Global: 322^nd place; English: 198^th place)

Khazan, Olga (2023-06-28). "Stop Firing Your Friends". The Atlantic. Retrieved 2023-07-02.

time.com (Global: 84^th place; English: 63^rd place)

Boothby, Erica J.; Cooney, Gus; Sandstrom, Gillian M.; Clark, Margaret S. (2018). "The Liking Gap in Conversations: Do People Like Us More Than We Think?". SAGE Journals. Vol. 29, no. 11. pp. 1742–1756. doi:10.1177/0956797618783714.
- Ducharme, Jamie (2018-09-17). "People Like You More Than You Think, a New Study Suggests". Time.

uchicago.edu (Global: 226^th place; English: 199^th place)

journals.uchicago.edu

Deresiewicz, William (2007). "Thomas Hardy and the History of Friendship Between the Sexes". The Wordsworth Circle. 38 (1–2): 56–63. doi:10.1086/TWC24043958. ISSN 0043-8006. S2CID 165725516.

usnews.com (Global: 720^th place; English: 417^th place)

health.usnews.com

Reinberg, Steven (2018-09-19). "'Liking Gap' Might Stand in Way of New Friendships". US News. Archived from the original on 2022-09-10. Retrieved 2022-09-10.
- Society for Personality and Social Psychology (2019-02-08). "Bridging the 'liking-gap,' researchers discuss awkwardness of conversations". Science Daily. Archived from the original on 2022-09-10. Retrieved 2022-09-10.

wamu.org (Global: low place; English: 8,983^rd place)

"How many friends do Americans have? A survey crunched the numbers". WAMU. Archived from the original on 2025-01-04. Retrieved 2025-01-04.

web.archive.org (Global: 1^st place; English: 1^st place)

"Definition for friend". Oxford Dictionaries. Oxford Dictionary Press. Archived from the original on January 26, 2011. Retrieved 25 May 2012.
Lafata, Alexia (17 Jun 2015). "Your Childhood Friendships Are The Best Friendships You'll Ever Have". Elite Daily. Archived from the original on 10 August 2016. Retrieved 21 June 2016.
"Friendships — Tuituia domain". practice.orangatamariki.govt.nz. Archived from the original on 2024-01-11. Retrieved 2024-01-11.
Verkuyten, Maykel; Masson, Kees (1996-10-01). "Culture and Gender Differences in the Perception of Friendship by Adolescents". International Journal of Psychology. 31 (5): 207–217. doi:10.1080/002075996401089. ISSN 0020-7594. Archived from the original on 2023-07-26. Retrieved 2023-07-26.
Sparks, Glenn (August 7, 2007). "Study shows what makes college buddies lifelong friends". Purdue University News. Archived from the original on 2019-04-07.
Williams, Alex (13 July 2012). "Friends of a Certain Age: Why Is It Hard To Make Friends Over 30?". The New York Times. Archived from the original on 28 October 2012. Retrieved October 25, 2012.
Bryant, Susan. "Workplace Friendships: Asset or Liability?". Monster.com. Archived from the original on 2013-01-26. Retrieved October 25, 2012.
"How many friends do Americans have? A survey crunched the numbers". WAMU. Archived from the original on 2025-01-04. Retrieved 2025-01-04.
Berndt, Thomas J. (2002). "Friendship Quality and Social Development" (PDF). Current Directions in Psychological Science. 11. American Psychological Society: 7–10. doi:10.1111/1467-8721.00157. S2CID 14785379. Archived (PDF) from the original on 2019-08-18. Retrieved 2016-10-22.
Reinberg, Steven (2018-09-19). "'Liking Gap' Might Stand in Way of New Friendships". US News. Archived from the original on 2022-09-10. Retrieved 2022-09-10.
- Society for Personality and Social Psychology (2019-02-08). "Bridging the 'liking-gap,' researchers discuss awkwardness of conversations". Science Daily. Archived from the original on 2022-09-10. Retrieved 2022-09-10.
- Wiener, Judith; Schneider, Barry H. (2002). "A multisource exploration of the friendship patterns of children with and without learning disabilities". Journal of Abnormal Child Psychology. 30 (2): 127–41. doi:10.1023/A:1014701215315. PMID 12002394. S2CID 42157217. Archived from the original on 27 September 2018. Retrieved 26 September 2017.
  - Hoza, Betsy (June 7, 2007). "Peer Functioning in Children With ADHD". Journal of Pediatric Psychology. 32 (6): 101–06. doi:10.1016/j.ambp.2006.04.011. PMC 2572031. PMID 17261489.
  - "Friendships & Social Relationships". National Down Syndrome Society. Archived from the original on 2023-07-26. Retrieved 2023-07-26.
  - Heingartner, Douglas, ed. (2020-10-20). "Women are more likely than men to say they have a best friend". PsychNewsDaily. Archived from the original on 2020-10-20. Retrieved 2020-10-21.
  - Sias, Patricia; Bartoo, Heidi (2007). "Friendship, Social Support, and Health". In L'Abate, Luciano (ed.). Low-Cost Approaches to Promote Physical and Mental Health: Theory, Research, and Practice. New York: Springer-Verlag. pp. 455–472. ISBN 978-0-387-36898-6. Archived from the original on 2021-06-20. Retrieved 2020-12-23.

wiley.com (Global: 150^th place; English: 174^th place)

onlinelibrary.wiley.com

Verkuyten, Maykel; Masson, Kees (1996-10-01). "Culture and Gender Differences in the Perception of Friendship by Adolescents". International Journal of Psychology. 31 (5): 207–217. doi:10.1080/002075996401089. ISSN 0020-7594. Archived from the original on 2023-07-26. Retrieved 2023-07-26.

worldcat.org (Global: 4^th place; English: 4^th place)

search.worldcat.org

Howes, Carollee (1983). "Patterns of Friendship". Child Development. 54 (4): 1041–1053. doi:10.2307/1129908. ISSN 0009-3920. JSTOR 1129908.
DeJesus, Jasmine M.; Rhodes, Marjorie; Kinzler, Katherine D. (2013-10-07). "Evaluations Versus Expectations: Children's Divergent Beliefs About Resource Distribution". Cognitive Science. 38 (1): 178–193. doi:10.1111/cogs.12093. ISSN 0364-0213. PMID 24117730. S2CID 8358667.
Liberman, Zoe; Shaw, Alex (November 2018). "Secret to friendship: Children make inferences about friendship based on secret sharing". Developmental Psychology. 54 (11): 2139–2151. doi:10.1037/dev0000603. ISSN 1939-0599. PMID 30284884. S2CID 52914199.
Liberman, Zoe; Shaw, Alex (August 2019). "Children use similarity, propinquity, and loyalty to predict which people are friends". Journal of Experimental Child Psychology. 184: 1–17. doi:10.1016/j.jecp.2019.03.002. ISSN 0022-0965. PMID 30974289. S2CID 109941102.
Verkuyten, Maykel; Masson, Kees (1996-10-01). "Culture and Gender Differences in the Perception of Friendship by Adolescents". International Journal of Psychology. 31 (5): 207–217. doi:10.1080/002075996401089. ISSN 0020-7594. Archived from the original on 2023-07-26. Retrieved 2023-07-26.
Crosnoe, Robert; Needham, Belinda (2004). "Holism, contextual variability, and the study of friendships in adolescent development". Child Development. 75 (1): 264–279. doi:10.1111/j.1467-8624.2004.00668.x. ISSN 0009-3920. PMID 15015689.
Willis, Amy (November 8, 2011). "Most adults have 'only two close friends'". The Telegraph. London. Archived from the original on 2022-01-11. Retrieved August 11, 2013.
- Brashears, Matthew E. (2011). "Small networks and high isolation? A reexamination of American discussion networks". Social Networks. 33 (4). Elsevier BV: 331–341. doi:10.1016/j.socnet.2011.10.003. ISSN 0378-8733.
- Hall, Jeffrey A. (2019). "How many hours does it take to make a friend?". Journal of Social and Personal Relationships. 36 (4): 1278–1296. doi:10.1177/0265407518761225. ISSN 0265-4075. Retrieved 2026-04-12.
- Dunbar, R.I.M. (January 2018). "The Anatomy of Friendship". Trends in Cognitive Sciences. 22 (1): 32–51. doi:10.1016/j.tics.2017.10.004. ISSN 1364-6613. PMID 29273112. S2CID 31147785.
- Williams, Keelah E.G.; Krems, Jaimie Arona; Ayers, Jessica D.; Rankin, Ashley M. (January 2022). "Sex differences in friendship preferences". Evolution and Human Behavior. 43 (1): 44–52. Bibcode:2022EHumB..43...44W. doi:10.1016/j.evolhumbehav.2021.09.003. ISSN 1090-5138. S2CID 244009099.
- David-Barrett, Tamas; Rotkirch, Anna; Carney, James; Behncke Izquierdo, Isabel; Krems, Jaimie A.; Townley, Dylan; McDaniell, Elinor; Byrne-Smith, Anna; Dunbar, Robin I. M. (2015-03-16). Jiang, Luo-Luo (ed.). "Women Favour Dyadic Relationships, but Men Prefer Clubs: Cross-Cultural Evidence from Social Networking". PLOS ONE. 10 (3) e0118329. Bibcode:2015PLoSO..1018329D. doi:10.1371/journal.pone.0118329. ISSN 1932-6203. PMC 4361571. PMID 25775258.
- Pearce, Eiluned; Machin, Anna; Dunbar, Robin I. M. (18 October 2020). "Sex Differences in Intimacy Levels in Best Friendships and Romantic Partnerships". Adaptive Human Behavior and Physiology. 7 (1). Springer Science and Business Media LLC: 1–16. doi:10.1007/s40750-020-00155-z. ISSN 2198-7335. S2CID 226358247.
- Deresiewicz, William (2007). "Thomas Hardy and the History of Friendship Between the Sexes". The Wordsworth Circle. 38 (1–2): 56–63. doi:10.1086/TWC24043958. ISSN 0043-8006. S2CID 165725516.
- Doucerain, Marina M.; Ryder, Andrew G.; Amiot, Catherine E. (October 2021). "What Are Friends for in Russia Versus Canada?: An Approach for Documenting Cross-Cultural Differences". Cross-Cultural Research. 55 (4): 382–409. doi:10.1177/10693971211024599. ISSN 1069-3971. S2CID 236265614.
- Tillmann-Healy, Lisa M. (2003-10-01). "Friendship as Method". Qualitative Inquiry. 9 (5): 729–749. doi:10.1177/1077800403254894. ISSN 1077-8004. S2CID 144256070.
- Cooper, John M. (1977). "Aristotle on the Forms of Friendship". The Review of Metaphysics. 30 (4): 619–648. ISSN 0034-6632. JSTOR 20126987.
- Lu, Peiqi; Oh, Jeewon; Leahy, Katelin E.; Chopik, William J. (2021). "Friendship Importance Around the World: Links to Cultural Factors, Health, and Well-Being". Frontiers in Psychology. 11. Frontiers Media SA. doi:10.3389/fpsyg.2020.570839. ISSN 1664-1078. PMC 7848226.
- Trivers, Robert L. (March 1971). "The Evolution of Reciprocal Altruism". The Quarterly Review of Biology. 46 (1): 35–57. doi:10.1086/406755. ISSN 0033-5770.
- DeScioli, Peter; Kurzban, Robert (2009-06-03). "The Alliance Hypothesis for Human Friendship". PLOS ONE. 4 (6) e5802. Bibcode:2009PLoSO...4.5802D. doi:10.1371/journal.pone.0005802. ISSN 1932-6203. PMC 2688027. PMID 19492066.
- DeScioli, Peter; Kurzban, Robert; Koch, Elizabeth N.; Liben-Nowell, David (January 2011). "Best Friends". Perspectives on Psychological Science. 6 (1): 6–8. doi:10.1177/1745691610393979. ISSN 1745-6916. PMID 26162107. S2CID 212547.
- Jorm, Anthony F. (2005). "Social networks and health: it's time for an intervention trial". Journal of Epidemiology and Community Health. 59 (7): 537–538. doi:10.1136/jech.2004.031559. ISSN 0143-005X. PMC 1757066. PMID 15965132.
- Shen, Chun; Rolls, Edmund T; Xiang, Shitong; Langley, Christelle; Sahakian, Barbara J; Cheng, Wei; Feng, Jianfeng (2023-07-03). Whelan, Robert; Büchel, Christian; Whelan, Robert; Schreuders, Lisa (eds.). "Brain and molecular mechanisms underlying the nonlinear association between close friendships, mental health, and cognition in children". eLife. 12 e84072. doi:10.7554/eLife.84072. ISSN 2050-084X. PMC 10317501. PMID 37399053.
  - "Is more always better?". eLife. 2023-07-03. Retrieved 2023-07-03.
  - Krems, Jaimie Arona; Williams, Keelah E.G.; Merrie, Laureon A.; Kenrick, Douglas T.; Aktipis, Athena (March 2022). "Sex (similarities and) differences in friendship jealousy". Evolution and Human Behavior. 43 (2): 97–106. Bibcode:2022EHumB..43...97K. doi:10.1016/j.evolhumbehav.2021.11.005. ISSN 1090-5138.
  - Hemelrijk, Charlotte K.; Luteijn, Madelein (1998-03-23). "Philopatry, male presence and grooming reciprocation among female primates: a comparative perspective". Behavioral Ecology and Sociobiology. 42 (3): 207–215. Bibcode:1998BEcoS..42..207H. doi:10.1007/s002650050432. ISSN 0340-5443. S2CID 43297085.
  - Shutt, Kathryn; MacLarnon, Ann; Heistermann, Michael; Semple, Stuart (2007-02-27). "Grooming in Barbary macaques: better to give than to receive?". Biology Letters. 3 (3): 231–233. doi:10.1098/rsbl.2007.0052. ISSN 1744-9561. PMC 2464693. PMID 17327200.
  - Silk, Joan B. (October 2002). "The Form and Function of Reconciliation in Primates". Annual Review of Anthropology. 31 (1): 21–44. doi:10.1146/annurev.anthro.31.032902.101743. ISSN 0084-6570.
  - Zamma, Koichiro (March 2002). "Grooming site preferences determined by lice infection among Japanese macaques in Arashiyama". Primates. 43 (1): 41–49. doi:10.1007/bf02629575. ISSN 0032-8332. PMID 12091746. S2CID 42457072.
  - Schino, Gabriele (2006-10-03). "Grooming and agonistic support: a meta-analysis of primate reciprocal altruism". Behavioral Ecology. 18 (1): 115–120. doi:10.1093/beheco/arl045. hdl:10.1093/beheco/arl045. ISSN 1465-7279.
  - Connor, Richard C.; Smolker, Rachel; Bejder, Lars (December 2006). "Synchrony, social behaviour and alliance affiliation in Indian Ocean bottlenose dolphins, Tursiops aduncus". Animal Behaviour. 72 (6): 1371–1378. doi:10.1016/j.anbehav.2006.03.014. ISSN 0003-3472. S2CID 4513557.
  - Connor, Richard; Mann, Janet; Watson-Capps, Jana (2006-06-09). "A Sex-Specific Affiliative Contact Behavior in Indian Ocean Bottlenose Dolphins, Tursiops sp". Ethology. 112 (7): 631–638. Bibcode:2006Ethol.112..631C. doi:10.1111/j.1439-0310.2006.01203.x. ISSN 0179-1613.
  - Strauss, Eli D.; Holekamp, Kay E. (2019-03-11). "Social alliances improve rank and fitness in convention-based societies". Proceedings of the National Academy of Sciences. 116 (18): 8919–8924. Bibcode:2019PNAS..116.8919S. doi:10.1073/pnas.1810384116. ISSN 0027-8424. PMC 6500164. PMID 30858321.
  - Cameron, Elissa Z.; Setsaas, Trine H.; Linklater, Wayne L. (2009-08-18). "Social bonds between unrelated females increase reproductive success in feral horses". Proceedings of the National Academy of Sciences. 106 (33): 13850–13853. Bibcode:2009PNAS..10613850C. doi:10.1073/pnas.0900639106. ISSN 0027-8424. PMC 2728983. PMID 19667179.

Friendship (English Wikipedia)

adsabs.harvard.edu (Global: 14th place; English: 9th place)

ui.adsabs.harvard.edu

bbc.co.uk (Global: 11th place; English: 10th place)

books.google.com (Global: 3rd place; English: 3rd place)

cambridge.org (Global: 209th place; English: 151st place)

doi.org (Global: 2nd place; English: 2nd place)

elifesciences.org (Global: low place; English: low place)

elitedaily.com (Global: 6,035th place; English: 4,509th place)

eurekalert.org (Global: 3,950th place; English: 3,383rd place)

ghostarchive.org (Global: 64th place; English: 28th place)

hdl.handle.net (Global: 66th place; English: 34th place)

jstor.org (Global: 23rd place; English: 15th place)

monster.com (Global: low place; English: low place)

career-advice.monster.com

ndss.org (Global: low place; English: low place)

nih.gov (Global: 5th place; English: 5th place)

pubmed.ncbi.nlm.nih.gov

ncbi.nlm.nih.gov

nytimes.com (Global: 7th place; English: 7th place)

orangatamariki.govt.nz (Global: low place; English: low place)

practice.orangatamariki.govt.nz

oxforddictionaries.com (Global: 1,689th place; English: 1,562nd place)

pewresearch.org (Global: 1,516th place; English: 983rd place)

psychnewsdaily.com (Global: low place; English: low place)

psychologytoday.com (Global: 2,259th place; English: 1,691st place)

purdue.edu (Global: 1,391st place; English: 979th place)

news.uns.purdue.edu

www2.psych.purdue.edu

researchgate.net (Global: 96th place; English: 89th place)

sagepub.com (Global: 609th place; English: 451st place)

journals.sagepub.com

sciencedaily.com (Global: 1,390th place; English: 1,286th place)

semanticscholar.org (Global: 15th place; English: 8th place)

api.semanticscholar.org

springer.com (Global: 182nd place; English: 172nd place)

telegraph.co.uk (Global: 40th place; English: 27th place)

theatlantic.com (Global: 322nd place; English: 198th place)

time.com (Global: 84th place; English: 63rd place)

uchicago.edu (Global: 226th place; English: 199th place)

journals.uchicago.edu

usnews.com (Global: 720th place; English: 417th place)

health.usnews.com

wamu.org (Global: low place; English: 8,983rd place)

web.archive.org (Global: 1st place; English: 1st place)

wiley.com (Global: 150th place; English: 174th place)

onlinelibrary.wiley.com

worldcat.org (Global: 4th place; English: 4th place)

search.worldcat.org

adsabs.harvard.edu (Global: 14^th place; English: 9^th place)

bbc.co.uk (Global: 11^th place; English: 10^th place)

books.google.com (Global: 3^rd place; English: 3^rd place)

cambridge.org (Global: 209^th place; English: 151^st place)

doi.org (Global: 2^nd place; English: 2^nd place)

elitedaily.com (Global: 6,035^th place; English: 4,509^th place)

eurekalert.org (Global: 3,950^th place; English: 3,383^rd place)

ghostarchive.org (Global: 64^th place; English: 28^th place)

hdl.handle.net (Global: 66^th place; English: 34^th place)

jstor.org (Global: 23^rd place; English: 15^th place)

nih.gov (Global: 5^th place; English: 5^th place)

nytimes.com (Global: 7^th place; English: 7^th place)

oxforddictionaries.com (Global: 1,689^th place; English: 1,562^nd place)

pewresearch.org (Global: 1,516^th place; English: 983^rd place)

psychologytoday.com (Global: 2,259^th place; English: 1,691^st place)

purdue.edu (Global: 1,391^st place; English: 979^th place)

researchgate.net (Global: 96^th place; English: 89^th place)

sagepub.com (Global: 609^th place; English: 451^st place)

sciencedaily.com (Global: 1,390^th place; English: 1,286^th place)

semanticscholar.org (Global: 15^th place; English: 8^th place)

springer.com (Global: 182^nd place; English: 172^nd place)

telegraph.co.uk (Global: 40^th place; English: 27^th place)

theatlantic.com (Global: 322^nd place; English: 198^th place)

time.com (Global: 84^th place; English: 63^rd place)

uchicago.edu (Global: 226^th place; English: 199^th place)

usnews.com (Global: 720^th place; English: 417^th place)

wamu.org (Global: low place; English: 8,983^rd place)

web.archive.org (Global: 1^st place; English: 1^st place)

wiley.com (Global: 150^th place; English: 174^th place)

worldcat.org (Global: 4^th place; English: 4^th place)