1. Effects of d-amphetamine on responding of squirrel monkeys maintained under second-order schedules of food presentation, electric shock presentation or stimulus-shock termination;Barrett;Journal of Pharmacology and Experimental Therapeutics,1981
2. Effects of chlordiazepoxide and d-amphetamine on responding of squirrel monkeys maintained under concurrent or second-order schedules of response-produced food or electric shock presentation;Barrett;Journal of Pharmacology and Experimental Therapeutics,1981
3. Effects of d-amphetamine on the behavior of pigeons maintained by a second-order schedule of reinforcement;Bond;Journal of Pharmacology and Experimental Therapeutics,1975
4. Relationship between response rate and reinforcement frequency in variable-interval schedules: III. The effect of d-amphetamine;Bradshaw;Journal of the Experimental Analysis of Behavior,1981
5. Relations between patterns of responding and the presentation of stimuli under second-order schedules;Byrd;Journal of the Experimental Analysis of Behavior,1969