References
- Barley , N. 1986 . “ Man and Animals ” . In The Animal in Photography 1843–1985 , Edited by: Noble , A. 81 – 81 . London : The Photographer's Gallery . in
- IUCN . 1980 . World Conservation Strategy , Vol. 1 , Gland, , Switzerland : IUCN . (4)
- Lever , C. 1985a . Naturalized Mammals of the World , 487 – 487 . London : Longman .
- Lever , C. September 1985b . New Scientist September , 81 – 81 . Letter 26
- McKenna , V. 1987 . Beyond the Bars: the Zoo Dilemma , Edited by: McKenna , V. , Travers , W. and Wray , J. 208 – 208 . Wellingborough : Thorsons . in
- Rawlins , C.G.C. May 1984 . BBC Wildlife May , 275 – 277 . Letter
- Scott , P. 1961 . The Eye of the Wind , 679 – 679 . London : Hodder and Stoughton .