Reference Base Black rhinoceros (Diceros bicornis) in U.S. Zoos, I. Ind...
Carlstead, K.; Mellen, J.; Kleiman, D.G., 1999. Black rhinoceros (Diceros bicornis) in U.S. Zoos, I. Individual behavior profiles and their relationship to breeding success. Zoo Biology 18 (1): 17-34, fig. 1, tables 1-5