1. Studies on behavior. II. The effects of pentobarbital, methamphetamine, and scopolamine on performances in pigeons involving discriminations;Dews;J. Pharacol. Exptl. Therap,1955
2. Studies on behavior. IV. Stimulant actions of methamphetamine;Dews;J. Pharmacol. Exptl. Therap,1958
3. Sustained behavior under delayed reinforcement;Ferster;J. exp. Psychol,1953
4. Schedules of reinforcement.