| Swayne, H.G.C., 1932. Northern Somaliland: pp. 234-239
| In: Maydon, H.C. Big game shooting in Africa. London, Seeley, Service and Co (The Lonsdale Library, vol. 14): pp. 1-445 |
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| Swayne, H.G.C., 1894. Further field-notes on the game-animals of Somaliland. Proceedings of the Zoological Society of London 1894: 316-323
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