Kirkwood, J.K.; Markham, J.; Hawkey, C.M.; Jackson, S.I. 1991. Plasma vitamin E response in two black rhinoceroses following dietary supplementation. Veterinary Record 128 (8): 185-186, fig. 1.
Lewis, J.C.M.; Kirkwood, J.K. 1990. Studies on Vitamin E supplementation in a black rhinoceros (Diceros bicornis). Veterinary Record 126: 558.
Kirkwood, J.K.; Eva, J.; Jackson, S.I.; Kichenside, T.; Harman, B.; Crawford, M.A. 1989. Nutrition and growth of hand-reared, low birthweight black rhinoceros (Diceros bicornis) during her first six months. Proceedings of the American Association of Zoo Veterinarians 1989: 32-41, figs. 1-5, tables 1-2.
Kirkwood, J.K. 1986. Incidences, causes and reduction of neonatal mortality in zoo ungulates. Proceedings of the American Association of Zoo Veterinarians 1986: 46-47, 1 table.






