| Ramsay, E.C.; Kasman, L.H.; Lasley, B.L., 1987. Urinary steroid evaluations to monitor ovarian function in exotic ungulates: V. Estrogen and pregnanediol-3-glucuronide excretion in the black rhinoceros (Diceros bicornis). Zoo Biology 6: 275-282, fig. 1, tables 1-2
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| Kassam, A.A.H.; Lasley, B.L., 1981. Estrogen excretory patterns in the Indian rhinoceros (Rhinoceros unicornis), determined by simplified urinary analysis. American Journal of Veterinary Research 42 (2): 251-255, figs. 1-5
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