1. American Psychiatric Association. (3rd ed., 1980). Diagnostic and statistical manual of mental disorders. Washington, DC: American Psychiatric Association.
2. American Psychiatric Association. (3rd ed. rev., 1987). Diagnostic and statistical manual of mental disorders. Washington, DC: American Psychiatric Association.
3. Asperger, H. (1944). Die autistischen psychopathen im kindersalter. Archiv für Psychiatrie und Nervenkrankheiten, 117, 76–136.
4. Attwood, A. (1984). The gestures of autistic children. Unpublished doctoral thesis, University of London.
5. Baltaxe, C. A. M. (1977). Pragmatic deficits in the language of autistic adolescents. Journal of Paediatric Psychology, 2, 176–80.