1. Anonyme, 1997.Treaty of Amsterdam amending the treaty on European Union, the treaties establishing the European communities and related acts, Official Journal, 340, available at http://eur-lex.europa.eu/en/treaties/dat/11997D/htm/11997D.html (last visit October 2, 2007).
2. Bock, B., Van Huik, M., 2007. Pig farmers and animal welfare: a study of beliefs, attitudes and behaviour of pig producers across Europe. In: Kjaernes, U., Miele, M., Roex, J. (Eds.), Attitudes of Consumers, Retailers and Producers to Farm Animal Welfare. WelfareQuality® Report No. 2. Cardiff University, Cardiff, pp. 73–124.
3. Bock, B., van Leeuwen, F., 2005. Review of socio-political and market developments of animal welfare schemes. In: Roex, J., Miele, M. (Ed.), Farm Animal Welfare Concerns, Consumers, Retailers and Producers. WelfareQuality® Report No. 1. Cardiff University, Cardiff, pp. 115–167.
4. Brambell, R., 1965. Report of the technical committee to enquire into the welfare of animals kept under intensive livestock husbandry systems. Her Majesty's Stationery Office. London, 85 pp.
5. A Guide to Quality Management Systems for the Food Industry;Early,1995