1. Ayllon, T., and Azrin, N. H. (1968).The Token Economy: A Motivational System for Therapy and Rehabilitation, Appleton-Century-Crofts, New York.
2. Ayllon, T., and Michael, J. (1959). The psychiatric nurse as a behavioral engineer.J. Exp. Anal. Behav. 2:323?334.
3. Baer, D. R., Wolf, M. M., and Risley, T. R. (1968). Some current dimensions of applied behavior analysis.J. Appl. Behav. Anal. 1:91?97.
4. Bailey, J. S., and Bostow, D. E. (1981).Research Methods in Applied Behavior Analysis, Copy Grafix, Tallahasse, Fla.
5. Bailey, J. S., and Pyles, D. A. M. (1989). Behavioral diagnostics. In Cipani, E. (ed.),The Treatment of Severe Behavior Disorders: Behavior Analysis Approaches, American Association on Mental Retardation, Washington, C.D.