| Walker, D., 2011. Legalise rhino horn to save the species. The Star, Johannesburg 11 July 2011: 1
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| Goss, P.; Merz, A.; Branham, M.; Walker, D.; Pearthree, P.; Sandys-Lumsdaine, N.; Leakey, R.; Pattee, G.B.; Mayhew, C.; Stewart, J., 2008. Tributes to Ian Craig. Newsletter of the Lewa Wildlife Conservancy no. 25: 1-16
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| Walker, D., 1922. The Prince in India: a record of the Indian tour of His Royal Highness the Prince of Wales - Nov. 1921 to March 1922. Bombay, Calcutta, London, Bennett, Coleman and Co, pp. 1-299
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