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
• 1998. website, Mammal Species of the World
• 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.
• Boitani, L., S. Bartoli. 1982. Simon & Schuster's Guide to Mammals. New York: Fireside/Simon & Schuster, Inc.
• Eltringham, S. 1999. The Hippos. San Diego, California: Academic Press.
• Huffman, B. 2004. "Hexaprotodon liberiensis" (On-line). The Ultimate Ungulate. Accessed March 09, 2009 at http://www.ultimateungulate.com/Artiodactyla/Hexaprotodon_liberiensis.html.
• J.-R. Boisserie. 2005. The phylogeny and taxonomy of Hippopotamidae (Mammalia: Artiodactyla): a review based on morphology and cladistic analysis. Zoological Journal of the Linnean Society 143:1-26
• Kingdon, J. 1997. The Kingdon Field Guide to African Mammals. San Diego, California: Academic Press.
• 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.
• Oliver, W. 1993. Status Survey and Conservation Action Plan: Pigs, Peccaries, and Hippos. Gland, Switzerland: IUCN.
• Orrell T. (custodian) (2013). ITIS Global: The Integrated Taxonomic Information System (version Sept 12). In: Species 2000 & ITIS Catalogue of Life, 11th March 2013 (Roskov Y., Kunze T., Paglinawan L., Orrell T., Nicolson D., Culham A., Bailly N., Kirk P., Bourgoin T., Baillargeon G., Hernandez F., De Wever A., eds). Digital resource at www.catalogueoflife.org/col/. Species 2000: Reading, UK.
• 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. 1992. Mammal Species of the World: A Taxonomic and Geographic Reference, 2nd ed., 3rd printing
• 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
• Wilson, Don E., and F. Russell Cole. 2000. Common Names of Mammals of the World. xiv + 204