1. Interrelationships between behavior and pharmacology as factors determining the effects of nicotine;Barrett;Pharmacology, Biochemistry & Behavior,1983
2. Modification of the behavioral effects of drugs by environmental variables;Barrett,1986
3. A drug preference procedure for use with human volunteers;de Wit,1987
4. Drug dependence: Myth or motive?;Falk;Pharmacology, Biochemistry & Behavior,1983
5. Schedules of reinforcement;Ferster,1957