1. Response variability in the white rat during conditioning, extinction, and reconditioning;Antonitis;Journal of Experimental Psychology,1951
2. Auto-shaping of the pigeon's key-peck;Brown;Journal of the Experimental Analysis of Behavior,1968
3. Variability of response location for pigeons responding under continuous reinforcement, intermittent reinforcement, and extinction;Eckerman;Journal of the Experimental Analysis of Behavior,1969
4. Ehrlich, P. R., & Raven, P. H. Differentiation of populations. Science, 1969, 165, 1228–1232.
5. The nature and determinants of adjunctive behavior;Falk,1972