Long-Term Effects of a Simple Contingency Management Program with Chronic Psychiatric Patients

Ayllon J. Azrin N. H. The token economy: A motivational system for therapy and rehabilitation. New York: Appleton, 1968.

Wexler D. B. Token and taboo: Behavior modification, token economies, and the law. In Franks C. Wilson T. (Ed.), Annual review of behavior therapy: Theory and practice. New York: Brunner/Mazel, 1974. Vol. 2. Pp. 279–309.