Friedmann, Y.; Downie, S.; Du Toit, R.; Leslie Jr., D.M.; Eustace, M.; Malangoni, J.; Trendler, K. 2011. Perspectives on dehorning and legalised trade in rhino horn as tools to combat rhino poaching. Proceedings of a workshop assessing legal trade in rhino horn as a tool in combating poaching as well as a detailed assessment of the efficacy of dehorning as a deterrent to poaching. Johannesburg, Endangered Wildlife Trust. pp. 1-56.
Friedmann, Y.; Daly, B. 2004. Red data book of the mammals of South Africa: a conservation assessment. Johannesburg, CBSG-EWT.
Friedmann, Y. 1998. Darting safaris – conservation right on target. Vision (EWT) 7: 64-71, figs. 1-7.






