American Psychiatric Association . (1987). Diagnostic and statistical manual of mental disorders (3rd ed., rev.). Washington, DC: Author.
2.
Hersen, M. , & Ammerman, R. T. (1989). Overview of new developments in child behavior therapy. In M. Hersen (Ed.), Innovations in child behavior therapy (pp. 3-31). New York: Springer.
3.
Matson, J. L. , & Barrett, R. P. (Eds.). (1982). Psychopathology in the mentally retarded. New York: Grune & Stratton.