1. A mathematical model of learning under schedules of interresponse time reinforcement;Ambler,1972
2. Properties of behaviour under random interval reinforcement schedules;Farmer;Journal of the Experimental Analysis of Behaviour,1963
3. Effects of a DRL contingency added to a fixed interval reinforcement schedule;Farmer;Journal of the Experimental Analysis of Behaviour,1964
4. Secondary reinforcement;Herrnstein,1966
5. On the law of effect;Herrnstein;Journal of the Experimental Analysis of Behaviour,1970