1. BULLOCK, DONALD H., & MALINE, DAVID B. Diagnosing child behavior: II. The behavior of retarded and non-retarded subjects in a psychological work-for-reward situation. Train. Sch. Bull., 1958, 55, 47–53.
2. KING, G. F., MERRELL, D. W., LOVINGER, E., & DENNY, M. R. Operant motor behavior in acute schizophrenia. J. Pers., 1957, 25, 317–326.
3. LINDSLEY, O. R. New techniques of analysis of psychotic behavior. Final Technical Report for Contract N5-ori-07662, Nov. 1956.