Gregory, J.W.

Holden, M.D.; Gregory, J.W.; Watkins, V.; Radford, L. 2006. Operant-conditioning programme for white rhinoceros, black rhinoceros and Indian or greater one-horned Asian rhinoceros Ceratotherium simum, Diceros bicornis and Rhinoceros unicornis at Whipsnade Wild Animal Park, Dunstable, UK. International Zoo Yearbook 40: 144-149, pls. 1-2.

Watkins, V.; Gregory, J.W. 1997. Conditioning for a greater one horned rhino (Rhinoceros unicornis) to accept foot treatment without anesthetic. Animal Keeper's Forum 24 (6): 250-256, 1 plate.

Gregory, J.W. 1896. The great Rift Valley, being the narrative of a journey to Mount Kenya and Lake Baringo, with some account of the geology, natural history, anthropology, and future prospects of British East Africa. London, John Murray. pp. i-xxi, 1-422.