Heyworth, R.P.
Heyworth, R. 1995. Ngorongoro: the last rhinos of northern Tanzania. Swara 18 (6): 18-21, figs. 1-3.
Borner, M.; Heyworth, R.; Laurie, W.A.; Chisanyo, A. 1993. Tanzania rhino conservation project. Interim report to the Tanzania Rhino Workshop, Arusha, May 1993. Arusha, Ministry of Tourism, Natural Resources and Environment (Wildlife division) with Frankfurt Zoological Society. pp. 1-48.






