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 (May, 2009) http://www.iucnredlist.org
• 2. Macdonald, D. (2001) The New Encyclopedia of Mammals. Oxford University Press, Oxford.
• 3. CITES (May, 2009) http://www.cites.org
• 4. Smithsonian Museum (April, 2002) http://nationalzoo.si.edu/animals/asianelephants/factpygmyhippo.cfm
• 5. Ultimate Ungulate (April, 2002) http://www.ultimateungulate.com/Artiodactyla/Hexaprotodon_liberiensis.html
• 6. African Mammals Database (April, 2002) http://www.gisbau.uniroma1.it/amd/amd142b.html
• 7. Lewison, R. (April, 2002) Pers. Comm.
• Huffman, B. 2004. "Hexaprotodon liberiensis" (On-line). The Ultimate Ungulate. Accessed March 09, 2009 at http://www.ultimateungulate.com/Artiodactyla/Hexaprotodon_liberiensis.html.
• Lang, E. 1990. Pygmy Hippoptamuses. Pp. 58-64 in B Grzimek, ed. Grzimek's Encyclopedia of Mammals, Vol. 5, 1 Edition. New York: McGraw-Hill Publishing Company.
• Leidy, 1991. Pygmy Hippopotamus. Pp. 1350-1351 in R Nowak, ed. Walker's Mammals of the World, Vol. 2, 5 Edition. Baltimore Maryland: Johns Hopkins University Press.
• Lewison, R., W. Oliver. 2008. "2008 IUCN Red List of Threatened Species" (On-line). IUCN 2008 Red List. Accessed September 03, 2008 at http://www.iucnredlist.org/details/10032.
• Prothero, D., S. Foss. 2007. The Evolution of Artiodactyls. Baltimore, Maryland: The Johns Hopkins University Press.
• Richard Weigl (2005) Longevity of Mammals in Captivity; from the Living Collections of the World. Kleine Senckenberg-Reihe 48: Stuttgart.
• Robinson, P. "River Horses and Water Cows" (On-line). Accessed December 10, 2008 at http://moray.ml.duke.edu/projects/hippos/Pygmy_Text.doc.
• Wilson, Don E., and DeeAnn M. Reeder, eds. 1993. Mammal Species of the World: A Taxonomic and Geographic Reference, 2nd ed., 3rd printing. xviii + 1207
• Wilson, Don E., and F. Russell Cole. 2000. Common Names of Mammals of the World. xiv + 204