1. FAWC updates the five freedoms;Anon;Vet. Rec.,1992
2. Ethology of Free-Ranging Domestic Animals;Arnold,1978
3. Report of the Technical Committee to Enquire into the Welfare of Animals Kept Under Intensive Livestock Husbandry Systems;Brambell,1965
4. A Natural History of Domesticated Animals;Clutton-Brock,1999
5. Cattle behaviour on subalpine range in southcentral Alaska;Compton;J. Anim. Sci.,1971