Irwin, R. B. (1969). Speech and hearing therapy: Clinical and educational principles and practices. Stanwix House.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रIrwin, Ruth Beckey. Speech and Hearing Therapy: Clinical and Educational Principles and Practices. Pittsburgh: Stanwix House, 1969.
एमएलए (9वां संस्करण) प्रशस्ति पत्रIrwin, Ruth Beckey. Speech and Hearing Therapy: Clinical and Educational Principles and Practices. Stanwix House, 1969.
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