1. Behaviourally mediated suppression of reproduction in female primates;Abbott;Journal of Zoology, London,1987
2. Anonymous, 2001. In: Proceedings of the Rhino keepers’ Workshop. Zoological Society of San Diego, San Diego.
3. AZA Rhino Research Advisory Group: Five-year Research Masterplan;AZA,2004
4. Animal Behavior Desk Reference: A Dictionary of Animal Behavior, Ecology, and Evolution;Barrows,2001
5. Can small, isolated primate populations be effectively reinforced through the release of individuals from a captive population?;Britt;Biological Conservation,2003