1. Aarts, M. N. C., Te Velde, H. M., & Van Woerkum, C. M. J. (2001). Hoe oordelen we over de veehouderij? Rathenau Institute. Den Haag, the Netherlands. ISBN 903439282.
2. Anonymous (2014). Attitudes of Dutch citizens toward animals, humans and the environment with regard to pig husbandry. Submitted.
3. Anonymous (2015). Attitudes of different stakeholders toward sow husbandry: A study to determine conflicting and matching attitudes toward animals, humans and the environment.
4. Asseldonk, M. v., Jong, M. d., Vlieger, K. d., & Huirne, R. (2005). Prevention and control of Foot-and-Mouth disease, classical swine fever and Avian influenza in the European Union: An integrated analysis of epidemiological, economic, and social-ethical aspects. Wageningen: Wageningen UR.
5. Barnett, J. L., Hemsworth, P. H., Cronin, G. M., Jongman, E. C., & Hutson, G. D. (2001). A review of the welfare issues for sows and piglets in relation to housing. Australian Journal of Agricultural Research, 52, 1–28.