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Darley, Frederic L., D. C. Spriestersbach, and Wendell 1906-1965.Diagnostic methods in speech pathology Johnson. Diagnostic Methods in Speech Pathology. 2nd ed. New York: Harper & Row, 1978.

Darley, Frederic L., et al. Diagnostic Methods in Speech Pathology. 2nd ed. Harper & Row, 1978.