1. American Psychiatric Association. (1980).Diagnostic and statistical manual of mental disorders (3rd. ed.). Washington, DC: Author.
2. American Psychiatric Association. (1987).Diagnostic and statistical manual of mental disorders (3rd ed., rev.). Washington, DC: Author.
3. Dunn-Rankin, P. (1983).Scaling methods. Hillsdale, NJ: Erlbuam.
4. Kanner, I. (1943). Autistic disturbances of affective contact.Nervous Child, 2, 217?250.
5. Rutter, M. (1972). Childhood schizopirenia reconsidered.Journal of Autism and Childhood Schizophrenia, 2,315?338.