1. Drugs and the discrimination of duration
2. and : Drugs, discrimination and signal detection theory. In and (eds.): ?Advances in Behavioral Pharmacology, Vol. 1.? New York: Academic Press, 1977, pp 139-166.
3. AUTO-SHAPING OF THE PIGEON'S KEY-PECK1
4. : The internal clock. In and (eds.): ?Cognitive Processes in Animal Behavior.? Hillsdale, NJ: L. Erlbaum Assoc, 1978, pp 277-310.