References
- DAWKINS, M. S. (2006) A user's guide to animal welfare science. Trends in Ecology & Evolution. 21 (2): 77–82.
- KING, L. A. (2003) Behavioural evaluation of the psychological welfare and environmental requirements of agricultural research animals: theory, measurement, ethics and practical implications. Institute of Laboratory Animal Research. 44 (3): 11.
- DAWKINS, M. S. (2004) Using behaviour to assess animal welfare. Animal Welfare. 13: 3–7.
- Kos, U. (2005) Do dogs show preferences for certain types of environmental enrichments. In XIIth International Conference. Warsaw: International Society for Animal Hygiene.
- BENSON, G. J. and ROLLIN, B. E. (2004) The Well-being of Farm Animals, challenges and solutions. Blackwell, New York.
- BROOM, D. M. (1986) Indicators of poor welfare. British Veterinary Journal. 142 (6): 524–526.
- HAGERTY, M. R. (1999) Testing Maslow's Hierarchy of Needs: National Quality-of-Life Across Time. Social Indicators Research. 46 (3): 249–271.
- MAIN, D. C. J., WHAY, H. R., LEEB, C. and WEBSTER, A. J. F. (2007) Formal animal-based welfare assessment in UK certification schemes. Animal Welfare 16: 233–236.
- ROLLIN, B. E. (2003) Assessing animal welfare at the farm and group level: the interplay of science and values. Animal Welfare. 12: 433–443.
- FRASER, D. (1997). Fraser on Animal Welfare, Science, and Ethics, in Animal Welfare. 6: 97–106.