Não informado. (1971). Language Speech and Hearing Services in Schools. American Speech-Language-Hearing Association.
Chicago-Zitierstil (17. Ausg.)Não informado. Language Speech and Hearing Services in Schools. Washington: American Speech-Language-Hearing Association, 1971.
MLA-Zitierstil (8. Ausg.)Não informado. Language Speech and Hearing Services in Schools. American Speech-Language-Hearing Association, 1971.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.