1. Allen, D. A., Steinberg, M., Dunn, M., Fein, D., Feinstein, C., Waterhouse, L., et al. (2001). Autistic disorder versus other pervasive developmental disorders in young children: Same or different? European Child and Adolescent Psychiatry, 10, 67–78.
2. American Psychiatric Association. (1968). Diagnostic and statistical manual of mental disorders (2nd ed.). Washington, DC: Author.
3. American Psychiatric Association. (1980). Diagnostic and statistical manual of mental disorders (3rd ed.). Washington, DC: Author.
4. American Psychiatric Association. (1987). Diagnostic and statistical manual of mental disorders (3, Revised ed.). Washington, DC: Author.
5. American Psychiatric Association. (1994). Diagnostic and statistical manual of mental disorders (4th ed.). Washington, DC: Author.