Não informado. (1971). Language Speech and Hearing Services in Schools. American Speech-Language-Hearing Association.
Chicago-referens (17:e uppl.)Não informado. Language Speech and Hearing Services in Schools. Washington: American Speech-Language-Hearing Association, 1971.
MLA-referens (8:e uppl.)Não informado. Language Speech and Hearing Services in Schools. American Speech-Language-Hearing Association, 1971.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.