1. Alcock, J.Animal behavior: An evolutionary approach (2nd ed.). Sunderland, Massachusetts: Sinaver, 1979.
2. Altman, J.Organic foundations of animal behavior. New York: Holt, Rinehart & Winston, 1966.
3. Appley, M. H. Personal communication, July 31, 1980.
4. Arkes, H. R., & Garske, J. P.Psychological theories of motivation. Monterey: Brooks/Cole, 1977.
5. Arnold, M. B. (Ed.).Feelings and emotions: The Loyola Symposium. New York: Academic Press, 1970.