PERKINS, W. H. (1978). Human perspectives in speech and language disorders. The C.V.Mosby co.
Lua i Stíl Chicago (17ú heag.)PERKINS, William H. Human Perspectives in Speech and Language Disorders. Saint Louis: The C.V.Mosby co, 1978.
Lua MLA (9ú heag.)PERKINS, William H. Human Perspectives in Speech and Language Disorders. The C.V.Mosby co, 1978.
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