Dierenfeld, E.S.; Waweru, F.K.; Du Toit, R.; Brett, R. 1990.Alpha -Tocopherol levels in plants consumed by black rhinoceros (Diceros bicornis): native browses compared with common zoo forages.Proceedings of the American Association of Zoo Veterinarians 1990: 219-221, 2 tables.
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Dierenfeld, E.S. 1990.Vitamin E levels measured in rhino browse plants.Around the Horn 1 (3): 1-2, fig. 1.
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Dierenfeld, E.S.; Citino, S.B. 1989.Circulating plasma a-tocopherol folowing a single inspection in the black rhinoceros (Diceros bicornis).Journal of Wildlife Diseases 25 (4): 647-648, fig. 1.