Perkins, W. H. (1978). Human perpsectives in speech and language disorders. The C. V. Mosby.
Chicago-čujuhus (17. p.)Perkins, William H. Human Perpsectives in Speech and Language Disorders. The C. V. Mosby, 1978.
MLA-čujuhus (9. p.)Perkins, William H. Human Perpsectives in Speech and Language Disorders. The C. V. Mosby, 1978.
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