1. Ainslie, G., & Herrnstein, R. J. (1981). Preference reversal and delayed reinforcement. Animal Learning & Behavior, 9, 476–482.
2. Alcock, J. (1998).Animal behavior: An evolutionary approach (6th ed.). Sunderland, MA: Sinauer.
3. Baum, W. M. (1973). The correlation-based law of effect. Journal of the Experimental Analysis of Behavior, 20,137–153.
4. Baum, W. M. (1989). Quantitative prediction and molar description of the environment. The Behavior Analyst, 12,167–176.
5. Baum, W. M. (1994). Understanding behaviorism: Science, behavior, and culture. New York: Addison Wesley Longman.