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van Schaik, C. P.; Fox, E. A.; Sitompul, A. F. (1996). “Manufacture and use of tools in wild Sumatran orangutans – implications or human evolution”. Naturwissenschaften83 (4): 186–88. Bibcode: 1996NW.....83..186V. doi:10.1007/BF01143062. PMID8643126.
van Schaik, C. P.; Ancrenaz, M.; Borgen, G.; Galdikas, B.; Knott, C. D.; Singleton, I.; Suzuki, A.; Utami, S. S. et al. (2003). “Orangutan cultures and the evolution of material culture”. Science299 (5603): 102–05. Bibcode: 2003Sci...299..102V. doi:10.1126/science.1078004. PMID12511649.
Rijksen, H. D. (December 1978). “A field study on Sumatran orang utans (Pongo pygmaeus abelii, Lesson 1827): Ecology, Behaviour and Conservation”. The Quarterly Review of Biology53 (4): 493–94. doi:10.1086/410942. JSTOR2826733.
loc.gov
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Robeson, Dave (1935) (英語). Al G. Barnes, Master Showman, as told by Al G. Barnes. Caldwell, Idaho: The Caxton Printers, Ltd.. pp. 102–103. LCCN35-12032. OCLC598387
Xu, X.; Arnason, U. (1996). “The mitochondrial DNA molecule of sumatran orangutan and a molecular proposal for two (Bornean and Sumatran) species of orangutan”. Journal of Molecular Evolution43 (5): 431–37. Bibcode: 1996JMolE..43..431X. doi:10.1007/BF02337514. PMID8875856.
Nater, A.; Mattle-Greminger, M. P.; Nurcahyo, A.; Nowak, M. G. et al. (2 November 2017). “Morphometric, Behavioral, and Genomic Evidence for a New Orangutan Species”. Current Biology27 (22): 3487–3498.e10. doi:10.1016/j.cub.2017.09.047. hdl:10230/34400. PMID29103940.
Zhang, Yingqi; Harrison, Terry (2017). “Gigantopithecus blacki: a giant ape from the Pleistocene of Asia revisited”. Yearbook of Physical Anthropology162 (S63): 153–77. doi:10.1002/ajpa.23150. PMID28105715.
Ibrahim, Yasamin Kh.; Tshen, Lim Tze; Westaway, Kira E.; Cranbrook, Earl of; Humphrey, Louise; Muhammad, Ros Fatihah; Zhao, Jian-xin; Peng, Lee Chai (December 2013). “First discovery of Pleistocene orangutan (Pongo sp.) fossils in Peninsular Malaysia: Biogeographic and paleoenvironmental implications” (英語). Journal of Human Evolution65 (6): 770–97. doi:10.1016/j.jhevol.2013.09.005. PMID24210657.
Winkler, L. A. (1989). “Morphology and relationships of the orangutan fatty cheek pads”. American Journal of Primatology17 (4): 305–19. doi:10.1002/ajp.1350170405. PMID31964053.
Zimmermann, N; Pirovino, M; Zingg, R; Clauss, M; Kaup, F. J.; Heistermann, M; Hatt, J. M.; Steinmetz, H. W. (2011). “Upper respiratory tract disease in captive orangutans (Pongo sp.): prevalence in 20 European zoos and predisposing factors”. Journal of Medical Primatology40 (6): 365–375. doi:10.1111/j.1600-0684.2011.00490.x. PMID21770970.
Singleton, I.; van Schaik, C. P. (2002). “The Social Organisation of a population of Sumatran orang-utans”. Folia Primatologica73 (1): 1–20. doi:10.1159/000060415. PMID12065937.
Fox, Elizabeth A (2001). “Homosexual behavior in wild Sumatran orangutans (Pongo pygmaeus abelii)”. American Journal of Primatology55 (3): 177–81. doi:10.1002/ajp.1051. PMID11746281.
de Blois, S. T.; Novak, M. A.; Bond, M. (1998). “Object Permanence in Orangutans (Pongo Pygmaeus) and Squirrel Monkeys (Saimiri Sciureus)”. Journal of Comparative Psychology112 (2): 137–52. doi:10.1037/0735-7036.112.2.137. PMID9642783.
Robert, S. (1986). “Ontogeny of mirror behavior in two species of great apes”. American Journal of Primatology10 (2): 109–17. doi:10.1002/ajp.1350100202. PMID31979488.
Ross, Marina Davila; Owren, Michael J; Zimmermann, Elke (2009). “Reconstructing the Evolution of Laughter in Great Apes and Humans”. Current Biology19 (13): 1106–11. doi:10.1016/j.cub.2009.05.028. PMID19500987.
Wich, S. A.; Swartz, K. B.; Hardus, M. E.; Lameira, A. R.; Stromberg, E.; Shumaker, R. W. (2008). “A case of spontaneous acquisition of a human sound by an orangutan”. Primates50 (1): 56–64. doi:10.1007/s10329-008-0117-y. PMID19052691.
van Schaik, C. P.; Fox, E. A.; Sitompul, A. F. (1996). “Manufacture and use of tools in wild Sumatran orangutans – implications or human evolution”. Naturwissenschaften83 (4): 186–88. Bibcode: 1996NW.....83..186V. doi:10.1007/BF01143062. PMID8643126.
O'Malley, R. C.; McGrew, W. C. (2000). “Oral tool use by captive orangutans (Pongo pygmaeus)”. Folia Primatologica71 (5): 334–41. doi:10.1159/000021756. PMID11093037.
Russon, A. E.; Compost, A.; Kuncoro, P.; Ferisa, A. (2014). “Orangutan Fish Eating, Primate Aquatic Fauna Eating, and Their Implications for the Origins of Ancestral Hominin Fish Eating”. Journal of Human Evolution77: 50–63. doi:10.1016/j.jhevol.2014.06.007. PMID25038033.
van Schaik, Carel P.; Knott, Cheryl D. (2001). “Geographic variation in tool use onNeesia fruits in orangutans”. American Journal of Physical Anthropology114 (4): 331–342. doi:10.1002/ajpa.1045. PMID11275962.
Russon, AE; Handayani, DP; Kuncoro, P; Ferisa, A. (2007). “Orangutan leaf-carrying for nest-building: toward unraveling cultural processes”. Animal Cognition10 (2): 189–202. doi:10.1007/s10071-006-0058-z. PMID17160669.
van Schaik, C. P.; Ancrenaz, M.; Borgen, G.; Galdikas, B.; Knott, C. D.; Singleton, I.; Suzuki, A.; Utami, S. S. et al. (2003). “Orangutan cultures and the evolution of material culture”. Science299 (5603): 102–05. Bibcode: 2003Sci...299..102V. doi:10.1126/science.1078004. PMID12511649.
van Wyhe, John; Kjærgaard, Peter C. (1 June 2015). “Going the whole orang: Darwin, Wallace and the natural history of orangutans” (英語). Studies in History and Philosophy of Science Part C: Studies in History and Philosophy of Biological and Biomedical Sciences51: 53–63. doi:10.1016/j.shpsc.2015.02.006. ISSN1369-8486. PMID25861859.
Cheyne, S. M.; Thompson, C. J.; Phillips, A. C.; Hill, R. M.; Limin, S. H. (2007). “Density and population estimate of gibbons (Hylobates albibarbis) in the Sabangau catchment, Central Kalimantan, Indonesia”. Primates49 (1): 50–56. doi:10.1007/s10329-007-0063-0. PMID17899314.
Voigt, M; Wich, S. A.; Ancrenaz, M (2018). “Global demand for natural resources eliminated more than 100,000 Bornean Orangutans”. Current Biology28 (5): P761–769.E5. doi:10.1016/j.cub.2018.01.053. PMID29456144.
Nater, Alexander; Mattle-Greminger, Maja P.; Nurcahyo, Anton; Nowak, Matthew G.; Manuel, Marc de; Desai, Tariq; Groves, Colin; Pybus, Marc et al. (2 November 2017). “Morphometric, Behavioral, and Genomic Evidence for a New Orangutan Species” (英語). Current Biology27 (22): 3487–3498.e10. doi:10.1016/j.cub.2017.09.047. hdl:10230/34400. ISSN0960-9822. PMID29103940.
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Robeson, Dave (1935) (英語). Al G. Barnes, Master Showman, as told by Al G. Barnes. Caldwell, Idaho: The Caxton Printers, Ltd.. pp. 102–103. LCCN35-12032. OCLC598387
van Wyhe, John; Kjærgaard, Peter C. (1 June 2015). “Going the whole orang: Darwin, Wallace and the natural history of orangutans” (英語). Studies in History and Philosophy of Science Part C: Studies in History and Philosophy of Biological and Biomedical Sciences51: 53–63. doi:10.1016/j.shpsc.2015.02.006. ISSN1369-8486. PMID25861859.
Nater, Alexander; Mattle-Greminger, Maja P.; Nurcahyo, Anton; Nowak, Matthew G.; Manuel, Marc de; Desai, Tariq; Groves, Colin; Pybus, Marc et al. (2 November 2017). “Morphometric, Behavioral, and Genomic Evidence for a New Orangutan Species” (英語). Current Biology27 (22): 3487–3498.e10. doi:10.1016/j.cub.2017.09.047. hdl:10230/34400. ISSN0960-9822. PMID29103940.