Watson, R.; Edwards, K.; Walker, Sue; Moralie, C.; Brown, J., 2010. The development of an enzyme immuno-assay to non-invasively measure adrenal activity in the okapi (Okapia johnstoni), black rhino (Diceros bicornis) and Asian elephant (Elephas maximus). BIAZA Zoo Research News 11 (3): 17
Watson, R.M.; Graham, A.D.; Parker, I.S.C., 1969. A census of the large mammals of Loliondo Controlled Area, Northern Tanzania. East African Wildlife Journal 7: 43-59, figs. 1-4, tables 1-6, map 1
Watson, R.M.; Turner, M.I.M., 1965. A count of the large mammals of Lake Manyara National Park: results and discussion. East African Wildlife Journal 3: 95-98, figs. 1-2, table 1
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