1. Berkson, G., & Davenport, R. K. Stereotyped movements of mental defectives. I. Initial survey.American Journal of Mental Deficiency, 1962,66, 849?852.
2. Campbell, C. M. Stereotyped and expressive movements in imbeciles.American Journal of Mental Deficiency, 1968,73, 187?194.
3. Gesell, A., & Amatruda, C. S. In H. Knobloch & B. Pasamanick (Eds.),Developmental diagnosis. Hagerstown, Maryland: Harper & Row, 1974.
4. Grossman, H. J.Manual on terminology and classification in mental retardation. Washington, D.C.: American Association on Mental Deficiency, 1973.
5. Hinsie, L. E., & Campbell, R. J.Psychiatric dictionary. New York: Oxford University Press, 1970.