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Cosens, L.; Crowley, M.; Johnson, R.; Wulff, M. 2009. The oldest of the old. Animal Keeper’s Forum 36 (4/5): 150-155.
Johnson, R.; Doward, N.; Duckett, W.; Beare, N. 1991. Chete black rhino expedition to Zimbabwe. Journal Cambridge University Explorers and Travelers Club 26: 25-28, fig. 1.
Johnson, R.; Doward, N. 1991. Chete 1990: a Cambridge University expedition to Zimbabwe. Cambridge, Explorers and Travelers Club. pp. 1-159.






