J Exp Anal Behav, Vol. 47, No. 2. (March 1987), pp. 241-247.
Behavioural Processes, Vol. In Press, Corrected Proof
Psychological Review, Vol. 44 (1937), pp. 379-394.
(1992)
J Comp Physiol Psychol, Vol. 64, No. 2. (October 1967), pp. 356-359.
J Comp Psychol, Vol. 117, No. 1. (March 2003), pp. 111-118.
Behavior Therapy, Vol. 20 (1989), pp. 337-355.
Psychol Rev, Vol. 65, No. 5. (September 1958), pp. 272-282.
J Pediatr Oncol Nurs, Vol. 11, No. 2. (April 1994), pp. 55-63.
J Appl Behav Anal, Vol. 26, No. 4. (1993), pp. 469-470.
J Appl Behav Anal, Vol. 35, No. 2. (2002), pp. 191-194.
Animal Learning and Behavior, Vol. 23, No. 3. (August 1995), pp. 245-255.
Journal of Applied Behavior Analysis Fal 1978; Vol.11 (3): 435
Journal of the Experimental Analysis of Behavior Nov.1973; Vol.20 (3): 355 362
Proceedings of the Annual Convention of the American Psychological Association, Vol. . 7, No. Pt. 2. (1972), pp. 749-750.
Journal of the Experimental Analysis of Behavior (1965)
Science (1963)
Learning and Motivation May 1977; Vol.8 (2): 263 274
Aggressive Behavior, Vol. 1, No. 3. (1975), pp. 213-215.
Animal Behaviour Nov.1973; Vol.21 (4): 665 672
Animal Learning and Behavior Nov.1973; Vol.1.(4): 302 306