1. Bedau, H. A. (1991). Ethical aspects of environmental decision making.In R. A. Chechile & S. Carlisle (Eds.), Environmental decision making: A multidisciplimry perspective (pp. 176-194). New York: Van Nostrand Reinhold.
2. The animal's point of view, animal welfare and some other related matters
3. Bekoff, M. (1994). Cognitive ethology and the explanation of nonhuman animal behavior.In J.A. Meyer & H. L. Roitblat (Eds.), Comparative approaches to cognitive science. Cambridge, MA: MIT Press.