Comparative analysis of gonadal and adrenal activity in the black and white rhinoceros in North America by non-invasive endocrine monitoringv. 20No. 6463–486
Brown, Janine L., Bellem, A. C., Fouraker, M., Wildt, David E., and Roth, Terri L. 2001. "Comparative analysis of gonadal and adrenal activity in the black and white rhinoceros in North America by non-invasive endocrine monitoring." Zoo biology, 20, (6) 463–486.