1. BERKSON, G. 1967. Abnormal stereotyped motor acts. In J. Zubin & H. F. Hunt (Eds.), Comparative Psychopathology. New York: Grime & Stratton. Pp. 76–94.
2. BERKSON, G., & DAVENPORT, R. K. 1962. Stereotyped movements in mental defectives: I. Initial survey. American Journal of Mental Deficience., 66, 849–852.
3. BROWN, J. S. 1961. The Motivation of behaviour. New York: McGraw-Hill.
4. FOREHAND, R. L. 1970. Rate of stereotyped body rocking as a function of frustration of goal-directed behavior and alternate activity. Unpublished doctoral dissertation, University of Alabama.
5. FOREHAND, R., & BAUMEISTER, A.A. 1970. The effect of frustration on stereotyped body rocking: A follow-up. Psychological Reports., 31, 894.