1. IRF. Homepage. International Rhinoceros Foundation, Yulee, FL. Available at: http://www.rhinos-irf.org. Accessed 25 July 2009.
2. The World Conservation Union IUCN. West African black rhino feared extinct. IUCN Newsletter Species 46; July–Dec 2006:14. Available at: http://cmsdata.iucn.org/downloads/species_46_hi_respdf.pdf.
3. Wirz-Hlavacek G, Zschokke S, Studer P. International Studbook for the Greater One-Horned Rhinoceros Rhinoceros unicornis Linné, 1758. 11th Edition. Basel Zoo 2000.
4. International Studbook for the White Rhinoceroses;Ochs;Zoological Garden Berlin,2001
5. A review of the reproduction physiology of rhinoceros species in captivity;Roth;Int Zoo Yb,2006