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| Ward, S.; Melfi, V., 2004. The influence of stockmanship on the behaviour of black rhinoceros (Diceros bicornis). Proceedings of the Annual Symposium on Zoo Research 6: 160-169, figs. 1-5
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| Ward, S., 1775. A modern system of natural history, containing accurate descriptions, and faithful histories, of animals, vegetables and minerals. London, F.Newbery, vol. 2, pp. 1-200
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