The following bibliography has been generated by bringing together all references provided by our content partners. There may be duplication.

References

• 1. IUCN Red List (September, 2007) http://www.iucnredlist.org
• 2. Macdonald, D. (2001) The New Encyclopedia of Mammals. Oxford University Press, Oxford.
• 3. CITES (July, 2002) http://www.cites.org
• 4. Gunung Palung Orang-utan Project (July, 2002) http://www.fas.harvard.edu/~gporang/
• 5. Burnie, D. (2001) Animal. Dorling Kindersley, London.
• 6. Animal Diversity Web (July, 2002) http://animaldiversity.ummz.umich.edu/accounts/pongo/p._pygmaeus$narrative.html
• 7. Lorenz, M. (2004) Pers. Comm.
• 8. Yarrow Robertson, J.M. and van Schaik, C.P. (2001) Causal factors underlying the dramatic decline of the Sumatran orang-utan. Oryx, 35: 26 - 38.
• A. B. Taylor. 2006. Feeding behavior, diet, and the functional consequences of jaw form in orangutans, with implications for the evolution of Pongo. Journal of Human Evolution 50(4):377-393
• Cocks, L. 2003. Orangutans: And Their Battle for Survival. Claremont, West Australia: University of Western Australia Press.
• Cocks, L., K. Bullo. 2008. The processes for releasing a zoo-bred Sumatran orang-utan Pongo abelii at Bukit Tigapuluh National Park, Jambi, Sumatra. International Zoo Yearbook (OnlineEarly Articles), 42: XXX-XXX. Accessed January 09, 2008 at http://www.blackwell-synergy.com/doi/abs/10.1111/j.1748-1090.2007.00031.x.
• Durrell Wildlife Conservation Trust. Sumatran Orangutan. 69. Durrell Wildlife Conservation Trust: Durrell Wildlife Conservation Trust. 2006. Accessed November 26, 2007 at http://www.durrell.org/Animals/Sumatran-Orangutan/.
• Fox, E. 2002. Female tactics to reduce sexual harassment. Behavioral Ecology and Sociobiology, 52/2: 93-101.
• Lovell, N. 1990. Patterns Of Injury and Illness in Great Apes. United States of America: Smithsonian Institution.
• MacKinnon, J. 1974. In Search Of The Red Ape. Ballantine Books; A Division of Random House, Inc. New York, NY: Holt, Rinehart and Winston.
• Maple, T. 1980. Orang-utan Behavior. Van Nostrand Reinhold Company. New York, NY: Van Nostrand Reinhold Company.
• Rijksen, , Meijaard, Van Schaik. 2003. "DISTRIBUTION & HABITAT" (On-line). Accessed November 29, 2007 at http://spot.colorado.edu/~humphrey/fact%20sheets/orangutan/orangutan.htm.
• Rijksen, H. 1978. A field study on Sumatran oran utans (Pongo abelii): ecology, behavious and conservation.. WAU Dissertation Abstracts, Dissertation no. 710: 1-2. Accessed September 26, 2007 at http://library.wur.nl/wda/abstracts/ab710.html.
• Singleton, I., C. van Schaik. 2002. The Social Organisation of a Population of Sumatran Orang-Utans. Karger Journals, 73: 1-20. Accessed September 26, 2007 at http://content.karger.com/ProdukteDB/produkte.asp?typ=pdf&doi=60415.
• Singleton, I., S. Wich, M. Griffiths. 2007. "Pongo abelii" (On-line). IUCN 2007. 2007 IUCN Red List of Threatened Species.. Accessed December 11, 2007 at http://www.iucnredlist.org/search/details.php/39780/summ.
• Sumatran Orangutan Society, 2007. "Orangutan Facts" (On-line). Sumatran Orangutan Society. Accessed December 11, 2007 at http://www.orangutans-sos.org/faq.php.
• Thompson, G. 2007. "Orangutans sacrificed in palm oil boom" (On-line). ABC News. Accessed December 04, 2007 at http://www.abc.net.au/news/stories/2007/12/04/2108675.htm.
• WWF. 2007. "Sumatran Orangutan- Population & Distribution" (On-line). World Wildlife Foundation. Accessed September 26, 2007 at http://www.panda.org/about_wwf/what_we_do/species/about_species/species_factsheets/great_apes/orangutans/sumatran_orangutan/sumorangutan_population_distribution/index.cfm..
• WWF. 2007. "Sumatran orangutan" (On-line). WWF. Accessed October 17, 2007 at http://www.panda.org/about_wwf/what_we_do/species/about_species/species_factsheets/great_apes/orangutans/sumatran_orangutan/index.cfm.
• Wich, S., S. Utami-Atmoko, T. Mitra Setia, H. Rijksen, C. Schürmann. 2004. Life history of wild Sumatran orangutans ( Pongo abelii ). Journal of Human Evolution, 47/6: 385-398.
• Zoological Parks and Gardens Board of Victoria. 2004. "Sumatran Orangutan" (On-line). Accessed October 17, 2007 at http://www.zoo.org.au/education/factsheets/mam-sum_orang.pdf.