Tests of an equivalence rule for fixed and variable reinforcer delays, Journal of Experimental Psychology: Animal Behavior Processes, vol.10, pp.426-436, 1984. ,
Conditioned reinforcement and choice with delayed and uncertain primary reinforcers, Journal of the Experimental Analysis of Behavior, vol.63, pp.139-150, 1995. ,
Choice with certain and uncertain reinforcers in an adjusting delay procedure, Journal of the Experimental Analysis of Behavior, vol.66, pp.63-73, 1996. ,
Contiguity and conditioned reinforcement in probablistic choice, Journal of the Experimental Analysis of Behavior, vol.68, pp.317-327, 1997. ,
Reward magnitude in differential conditioning: Effects of sequential variables in acquisition and extinction, Journal of Comparative & Physiological Psychology, vol.86, pp.1141-1148, 1974. ,
Observing response choices in pigeons: The effect of reinforcement density and response cost. Learning & Motivation, vol.30, pp.201-220, 1999. ,
Discriminative stimulus location as a determinant of positive and negative behavioral contrast in the pigeon, Journal of the Experimental Analysis of Behavior, vol.23, pp.167-176, 1975. ,
Preference for a stimulus that follows a relatively aversive event: Contrast or delay reduction, Journal of the Experimental Analysis of Behavior, vol.87, pp.275-285, 2007. ,
Suboptimal choice in a percentage-reinforcement procedure: Effects of signal condition and terminal link length, Journal of the Experimental Analysis of Behavior, vol.53, pp.219-234, 1990. ,
Determinants of pigeons' choice between certain and probabilistic outcomes, Animal Learning & Behavior, vol.22, pp.239-251, 1994. ,
Inverse relations between preference and contrast, Journal of the Experimental Analysis of Behavior, vol.58, pp.303-312, 1992. ,
The role of observing responses in discrimination learning: Part I, Psychological Review, vol.59, pp.431-442, 1952. ,
Choice between reliable and unreliable reinforcement alternatives revisited: Preference for unreliable reinforcement, Journal of the Experimental Analysis of Behavior, vol.62, pp.353-366, 1994. ,
Second-order contrast based on the expectation of effort and reinforcement, Journal of Experiment Psychology: Animal Behavior Processes, vol.28, pp.64-74, 2002. ,
Observing and conditioned reinforcement, Behavioral & Brain Sciences, vol.6, pp.693-728, 1983. ,
Choice with uncertain outcomes: Conditioned reinforcement effects, Journal of the Experimental Analysis of Behavior, vol.53, pp.201-218, 1990. ,
Conditioned reinforcement: Choice and information, Handbook of operant behavior, pp.313-339, 1977. ,
Percentage reinforcement and choice, Journal of the Experimental Analysis of Behavior, vol.32, pp.335-340, 1979. ,
Journal of the Experimental Analysis of Behavior, vol.21, pp.463-473, 1974. ,