The psychological distance to reward, Journal of the Experimental Analysis of Behavior, vol.18, pp.23-34, 1972. ,

Choice and rate of reinforcement, Journal of the Experimental Analysis of Behavior, vol.12, pp.723-730, 1969. ,

Choice, conditioned reinforcement, and the Prius effect, The Behavior Analyst, vol.31, pp.95-111, 2008. ,

The effect of conditioned reinforcement rate on choice: A review, Journal of the Experimental Analysis of Behavior, vol.87, pp.409-421, 2007. ,

The chaining of fixed-interval schedules. Unpublished doctoral dissertation, 1958. ,

Stimulus functions in chained fixed-interval schedules, Journal of the Experimental Analysis of Behavior, vol.5, pp.167-173, 1962. ,

Preference for less segmented schedules fixed-time components in concurrent-chain schedules of reinforcement, Journal of the Experimental Analysis of Behavior, vol.46, pp.175-183, 1986. ,

Preference for simple interval schedules of reinforcement in concurrent chains: Effect of segmentation ratio, Journal of the Experimental Analysis of Behavior, vol.49, pp.9-20, 1988. ,

Psychological distance to reward: A human replication, Journal of the Experimental Analysis of Behavior, vol.51, pp.343-352, 1989. ,

Psychological distance to reward: Segmentation of aperiodic schedules of reinforcement, Journal of the Experimental Analysis of Behavior, vol.59, pp.401-410, 1993. ,

Hyperbolic value addition and general models of animal choice, Psychological Review, vol.108, pp.96-112, 2001. ,

Responding of pigeons under variable-interval schedules of signaled-delayed reinforcement: Effects of delay-signal duration, Journal of the Experimental Analysis of Behavior, vol.53, pp.103-121, 1990. ,

The strength of conditioned reinforcers as a function of frequency and probability of reinforcement, Conditioned reinforcement, pp.192-234, 1969. ,

Dependency, temporal contiguity, and response-independent reinforcement, Journal of the Experimental Analysis of Behavior, vol.27, pp.119-125, 1977. ,

Unsignalled delay of reinforcement in variable-interval schedules, Journal of the Experimental Analysis of Behavior, vol.30, pp.169-175, 1978. ,

Preference for conjoint schedules of primary reinforcement and brief-stimulus presentation. Unpublished doctoral dissertation, 1972. ,