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Antfolk, Jan; Salo, Benny; Alanko, Katarina; Bergen, Emilia; Corander, Jukka; Sandnabba, N. Kenneth; Santtila, Pekka (2015). "Women's and men's sexual preferences and activities with respect to the partner's age: evidence for female choice". Evolution & Human Behavior. 36 (1): 73–79. Bibcode:2015EHumB..36...73A. doi:10.1016/j.evolhumbehav.2014.09.003.
Luke, N. (2005). "Confronting the 'Sugar Daddy' Stereotype: Age and Economic Asymmetries and Risky Sexual Behavior in Urban Kenya". International Family Planning Perspectives. 31 (1): 6–14. doi:10.1363/3100605. JSTOR3649496. PMID15888404.
Kenrick, D.; Keefe, R.; Gabrielidis, C.; Cornelius, J. (1996). "Adolescents' Age Preferences for Dating Partners: Support for an Evolutionary Model of Life-History Strategies". Child Development. 67 (4): 1499–1511. doi:10.2307/1131714. JSTOR1131714. PMID8890497.
Atkinson, M. P.; Glass, B. L. (1985). "Marital age heterogamy and homogamy, 1900 to 1980". Journal of Marriage and the Family. 47 (3): 685–691. doi:10.2307/352269. JSTOR352269.
Darroch, J. E.; Landry, D.J.; Oslak, S. (1999). "Age differences between sexual partners in the United States". Family Planning Perspectives. 31 (4): 160–167. doi:10.2307/2991588. JSTOR2991588. PMID10435214.
Wilson, Ben; Smallwood, Steve (2008). "Age differences at marriage and divorce"(PDF). Population Trends (132). Office for National Statistics: 17–25. PMID18700520. Archived(PDF) from the original on 24 September 2015. Retrieved 27 December 2014.
Kenrick, Douglas; Keefe, Richard; Gabrielidis, Cristina; Comelius, Jeffrey (1996). "Adolescents' Age Preferences for Dating Partners: Support for an Evolutionary Model of Life-History Strategies". Child Development. 67 (4): 1499–1511. doi:10.1111/j.1467-8624.1996.tb01810.x. PMID8890497.
Luke, N. (2005). "Confronting the 'Sugar Daddy' Stereotype: Age and Economic Asymmetries and Risky Sexual Behavior in Urban Kenya". International Family Planning Perspectives. 31 (1): 6–14. doi:10.1363/3100605. JSTOR3649496. PMID15888404.
Kenrick, D.; Keefe, R.; Gabrielidis, C.; Cornelius, J. (1996). "Adolescents' Age Preferences for Dating Partners: Support for an Evolutionary Model of Life-History Strategies". Child Development. 67 (4): 1499–1511. doi:10.2307/1131714. JSTOR1131714. PMID8890497.
Luke, N (2005). "Confronting the 'Sugar Daddy' Stereotype: Age and Economic Asymmetries and Risky Sexual Behavior in Urban Kenya". International Family Planning Perspectives. 31 (1): 6–14. doi:10.1363/3100605. PMID15888404.
Darroch, J. E.; Landry, D.J.; Oslak, S. (1999). "Age differences between sexual partners in the United States". Family Planning Perspectives. 31 (4): 160–167. doi:10.2307/2991588. JSTOR2991588. PMID10435214.
Wilson, Ben; Smallwood, Steve (2008). "Age differences at marriage and divorce"(PDF). Population Trends (132). Office for National Statistics: 17–25. PMID18700520. Archived(PDF) from the original on 24 September 2015. Retrieved 27 December 2014.
Ben Wilson and Steve Smallwood, "Age differences at marriage and divorce", Population Trends 132, Summer 2008, Office for National Statistics [1]Archived 14 November 2012 at the Wayback Machine
Bjorklund, D. F.; Shackelford, T. K. (1999). "Differences in parental investment contribute to important differences between men and women". Current Directions in Psychological Science. 8 (3): 86–89. doi:10.1111/1467-8721.00020. S2CID39325238.
Kenrick, D. T.; Keefe, R. C. (1992). "Age preferences in mates reflect sex differences in human reproductive strategies". Behavioral and Brain Sciences. 15 (1): 75–91. doi:10.1017/s0140525x00067595. S2CID145276497.
Wilson, Ben; Smallwood, Steve (2008). "Age differences at marriage and divorce"(PDF). Population Trends (132). Office for National Statistics: 17–25. PMID18700520. Archived(PDF) from the original on 24 September 2015. Retrieved 27 December 2014.
Ben Wilson and Steve Smallwood, "Age differences at marriage and divorce", Population Trends 132, Summer 2008, Office for National Statistics [1]Archived 14 November 2012 at the Wayback Machine
Rodale, Inc. (April 2007). "Best Life". Best Life. Rodale, Inc.: 21. ISSN1548-212X. Archived from the original on 8 January 2017. Retrieved 8 May 2017.
Hans Erikson (1964). The Rhythm of the Shoe. Jacaranda Press. p. 87. Archived from the original on 8 January 2017. Retrieved 8 May 2017.
Rodale, Inc. (April 2007). "Best Life". Best Life. Rodale, Inc.: 21. ISSN1548-212X. Archived from the original on 8 January 2017. Retrieved 8 May 2017.