↑Estes, R. (1991). The Behavior Guide to African Mammals, Including Hoofed Mammals, Carnivores, Primates. Los Angeles, University of California Press. pp. 218–221 ISBN0520080858.
↑Kleiman, D.G., Geist, V., McDade, M.C. (2004). Grzimek's Animal Life Encyclopedia. The Gale Group Inc.
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