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de Blois, S. T.; Novak, M. A.; Bond, M. (1998). "Object Permanence in Orangutans (Pongo Pygmaeus) and Squirrel Monkeys (Saimiri Sciureus)". Journal of Comparative Psychology. 112 (2): 137–52. doi:10.1037/0735-7036.112.2.137. PMID9642783.
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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.
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van Schaik, C. P.; Ancrenaz, M.; Borgen, G.; Galdikas, B.; Knott, C. D.; Singleton, I.; Suzuki, A.; Utami, S. S.; Merrill, M.; et al. (2003). "Orangutan cultures and the evolution of material culture". Science. 299 (5603): 102–05. Bibcode:2003Sci...299..102V. doi:10.1126/science.1078004. PMID12511649. S2CID25139547.
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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): 811–30. doi:10.1080/09502386.2020.1780281. S2CID221192990.
Hilloowala, R. A.; Trent, R. B. (1988). "Supraorbital ridge and masticatory apparatus I: Primates". Human Evolution. 3 (5): 343–50. 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.
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 Primatology. 40 (6): 365–375. doi:10.1111/j.1600-0684.2011.00490.x. PMID21770970. S2CID997385.
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.
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Fox, Elizabeth A (2001). "Homosexual behavior in wild Sumatran orangutans (Pongo pygmaeus abelii)". American Journal of Primatology. 55 (3): 177–81. 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): 435–55. 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.
van Schaik, C. P.; Ancrenaz, M.; Borgen, G.; Galdikas, B.; Knott, C. D.; Singleton, I.; Suzuki, A.; Utami, S. S.; Merrill, M.; et al. (2003). "Orangutan cultures and the evolution of material culture". Science. 299 (5603): 102–05. Bibcode:2003Sci...299..102V. doi:10.1126/science.1078004. PMID12511649. S2CID25139547.
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.
Didik, Prasetyo; Ancrenaz, Marc; Morrogh-Bernard, Helen C.; Atmoko, S. Suci Utami; Wich, Serge A.; van Schaik, Carel P. (2009). "Nest building in orangutans". In Wich, Serge A.; Atmoko, S. Suci Utami; Setia, Tatang Mitra; van Schaik, Carel P. (eds.). Orangutans: Geographic Variation in Behavioral Ecology and Conservation. Oxford University Press. pp. 270–75. ISBN978-0-19-921327-6. Archived from the original on 24 April 2016. Retrieved 16 December 2015.
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