1. Cohen, P. S., Looney, T. A., Campagnoni, F. R., & Lawler, C. P. 1985 A two-state model of reinforcer-induced motivation. In F. R. Brush, & J. B. Overmier (Eds.), Affect, conditioning, and cognition: Essays on the determinants of behavior. Hillsdale, NJ: Lawrence Erlbaum Associates. Pp.281-297.
2. Falk, J. L. 1961 Production of polydipsia in normal rats by an intermittent food schedule. Science, 133, 195-196.
3. Falk, J. L. 1966 Schedule-induced polydipsia as a function of fixed interval length. Journal of the Experimental Analysis of Behavior, 9, 37-39.
4. Falk, J. L. 1969 Conditions producing psychogenic polydipsia in animals. Annuals of the New York Academy of Science, 157, 569-593.
5. Flory, R. K. 1969 Attack behavior as a function of minimum inter-food interval. Journal of the Experimental Analysis of Behavior, 12, 825-828.