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Red Data Book species in the cape floristic region: threats, priorities and target species
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Deane, N.N.; Feely, J.M. 1974. The development of a South African game ranch. In: Geist, V.; Walther, F., The behaviour of ungulates and its relation to management. Morges, IUCN (Publications New series no. 24). vol. 2, pp. 882-88, 6 tables.
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Holub, E. 1890. Von der Capstadt ins Land der Maschukulumbe. Reisen im südlichen Afrika in den Jahren 1883-1887, vol. 2. Wien, Alfred Holder.
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Hengeler, A. 1895. Ein Thier-Ball. Fliegende Blätter, Munchen 102 (2595): 151, 1 fig..
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Guggisberg, C.A.W. 1963. The Wilderness is Free. London, Bailey Bros. and Swinfen. pp. 1-158.