Dixon, 1957
Langford, 1969, Operant drinking behavior and the prediction of instrumental performance, Psychonomic Science, 16, 166, 10.3758/BF03336356
Lewis, 1960
Premack, 1969, Catching up with common sense or two sides of a generalization: Reinforcement and punishment
Terhune, 1970, On the proportionality between the probability of not-running and the punishment effect of being forced to run, Learning and Motivation, 1, 141, 10.1016/0023-9690(70)90080-9
Weisman, 1966, Reinforcement and punishment produced by the same contingent event