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. Fleiss, J. L. (1981).Statistical methods for rates and proportions (2nd ed.). New York: Wiley.
4. Garfin, D. G., McCallon, D., & Cox, R. (1988). Validity and reliability of the Childhood Autism Rating Scale with autistic adolescents.Journal of Autism and Developmental Disorders, 18, 367?378.
5. Krug, D. A., Arick, J. R., & Almond, P. J. (1980 a).Autism Screening Instrument for Educational Planning. Portland, OR: ASIEP Educational.