1. BARNETT, S. A. The rat: A study in behavior. Chicago: Aldine, 1963.
2. BEECROFT, R. S. Classical conditioning. Goleta, Calif: Psychonomic Press, 1966.
3. CARR, R. M., & WILLIAMS, C. D. Exploratory behavior of three strains of rats. Journal of Comparative & Physiological Psychology, 1957, 50, 621–623.
4. FOSHEE, D. P. Quality of conditioned stimulus and strain of subjects as variables in avoidance learning (CAR). Unpublished Master’s thesis, Vanderbilt University, 1960.
5. GARCIA, J., & ERVIN, F. R. Gustatory-visceral and telereceptor-cutaneous conditioning—adaptation in internal and external milieus. Communications in behaviorial biology. Part A, Vol. 1. New York: Academic Press, 1968.