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O'Malley, R. C.; McGrew, W. C. (2000). "Oral tool use by captive orangutans (Pongo pygmaeus)". Folia Primatologica. 71 (5): 334–41. doi:10.1159/000021756. PMID11093037. S2CID19354930.
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 Evolution. 77: 50–63. doi:10.1016/j.jhevol.2014.06.007. PMID25038033.
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". Primates. 49 (1): 50–56. doi:10.1007/s10329-007-0063-0. PMID17899314. S2CID1792717.
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Hilloowala, R. A.; Trent, R. B. (1988). "Supraorbital ridge and masticatory apparatus I: Primates". Human Evolution. 3 (5): 343–350. doi:10.1007/BF02447216. S2CID83923845.
Galdikas, Birute M. F. (1988). "Orangutan Diet, Range, and Activity at Tanjung Puting, Central Borneo". International Journal of Primatology. 9 (1): 1–35. doi:10.1007/BF02740195. S2CID40513842.
Teboekhorst, I.; Schürmann, C.; Sugardjito, J. (1990). "Residential status and seasonal movements of wild orang-utans in the Gunung Leuser Reserve (Sumatera, Indonesia)". Animal Behaviour. 39 (6): 1098–1109. doi:10.1016/S0003-3472(05)80782-1. S2CID54322235.
Mitani, J. C.; Grether, G. F.; Rodman, P. S.; Priatna, D. (1991). "Associations among wild orang-utans: sociality, passive aggregations or chance". Animal Behaviour. 42 (1): 33–46. doi:10.1016/S0003-3472(05)80603-7. S2CID40824300.
Knox, A; Markx, J; How, E; Azis, A; Hobaiter, C; an Veen, F. J. F; Morrogh-Bernard, H (2019). "Gesture use in communication between mothers and offspring in wild Orang-Utans (Pongo pygmaeus wurmbii) from the Sabangau Peat-Swamp Forest, Borneo". International Journal of Primatology. 40 (3): 393–416. doi:10.1007/s10764-019-00095-w. S2CID195329265.
Fox, Elizabeth A (2001). "Homosexual behavior in wild Sumatran orangutans (Pongo pygmaeus abelii)". American Journal of Primatology. 55 (3): 177–181. doi:10.1002/ajp.1051. PMID11746281. S2CID21561581.
Scott, A. M.; Knott, C. D.; Susanto, T. W. (2019). "Are Male Orangutans a Threat to Infants? Evidence of Mother–Offspring Counterstrategies to Infanticide in Bornean Orangutans (Pongo pygmaeus wurmbii)". International Journal of Primatology. 44 (3): 435–455. doi:10.1007/s10764-019-00097-8. hdl:2144/39274. S2CID198190605.
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". Primates. 50 (1): 56–64. doi:10.1007/s10329-008-0117-y. PMID19052691. S2CID708682.
O'Malley, R. C.; McGrew, W. C. (2000). "Oral tool use by captive orangutans (Pongo pygmaeus)". Folia Primatologica. 71 (5): 334–41. doi:10.1159/000021756. PMID11093037. S2CID19354930.
Rubis, June Mary (2020). "The orang utan is not an indigenous name: knowing and naming the maias as a decolonizing epistemology". Cultural Studies. 34 (5): 811–830. doi:10.1080/09502386.2020.1780281. S2CID221192990.
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". Primates. 49 (1): 50–56. doi:10.1007/s10329-007-0063-0. PMID17899314. S2CID1792717.
Singer, P. (18 Juli 2008). "Of great apes and men". The Guardian. Diarsipkan dari versi aslinya tanggal 13 November 2012. Diakses tanggal 10 November 2008.
Didik, Prasetyo; Ancrenaz, Marc; Morrogh-Bernard, Helen C.; Atmoko, S. Suci Utami; Wich, Serge A.; van Schaik, Carel P. (2009). "Nest building in orangutans". Dalam Wich, Serge A.; Atmoko, S. Suci Utami; Setia, Tatang Mitra; van Schaik, Carel P. (ed.). Orangutans: Geographic Variation in Behavioral Ecology and Conservation. Oxford University Press. hlm. 270–275. ISBN978-0-19-921327-6. Diarsipkan dari versi aslinya tanggal 24 April 2016. Diakses tanggal 16 Desember 2015.
Singer, P. (18 Juli 2008). "Of great apes and men". The Guardian. Diarsipkan dari versi aslinya tanggal 13 November 2012. Diakses tanggal 10 November 2008.
Zimmer, Carl (21 April 2015). "When Darwin Met Another Ape". National Geographic Society. Diarsipkan dari versi aslinya tanggal 7 Juni 2020. Diakses tanggal 24 Februari 2020.
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