Não informado. (1971). Language Speech and Hearing Services in Schools. American Speech-Language-Hearing Association.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Language Speech and Hearing Services in Schools. Washington: American Speech-Language-Hearing Association, 1971.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Language Speech and Hearing Services in Schools. American Speech-Language-Hearing Association, 1971.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.