1. Alihan, M. A. (1938).Social Ecology: A Critical Analysis, Columbia University Press, New York.
2. Alland, A. (1969). Ecology and adaptation to parasitic diseases. In Vayda, A. P. (ed.),Environment and Cultural Behavior, Natural History Press, Garden City, N.Y.
3. Anderson, N. (1923).The Hobo, University of Chicago Press, Chicago.
4. Anderson, N. (1940).Men on the Move, University of Chicago Press, Chicago.
5. Barker, R. G. (1965). Explorations in ecological psychology.Am. Psychologist 20: 1–14.