1. Aristotle (1984[350 BCE]). On the Soul. In Barnes, Jr. (ed.) The complete works, pp. 641–692. New Jersey: Princeton University Press.
2. People or penguins: the case for optimal pollution;Baxter,1974
3. Meaning Matters: The Biosemiotic Basis of Bioethics;Beever;Biosemiotics,2012
4. Anthropocentrism: humans, animals, environments,2011
5. Beyond anthropocentrism;Campbell;Journal of the History of the Behavioral Sciences,1983