1. Alger, Janet M. and Steven F. Alger (2003) Cat Culture: The Social World of a Cat Shelter. Philadelphia: Temple University Press.
2. Animal Domestication in Geographic Perspective
3. Arluke, Arnold and Clinton Sanders (1996) Regarding Animals. Philadelphia: Temple University Press.
4. Audubon Society (no date) “The Passenger Pigeon.” Retrieved August, 2006 http://www.audubon.org/bird/BoA/F29_G3a.html
5. Bell, Michael Mayerfeld (1994) Childerley: Nature and Morality in a Country Village. Chicago: University of Chicago Press.