Schiefelbusch, R. L. (1974). Language perspectives-acquisition, retardation, and intervention: Robert K. Hoyt. University Park Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSchiefelbusch, Richard L. Language Perspectives-acquisition, Retardation, and Intervention: Robert K. Hoyt. Baltimore: University Park Press, 1974.
एमएलए (9वां संस्करण) प्रशस्ति पत्रSchiefelbusch, Richard L. Language Perspectives-acquisition, Retardation, and Intervention: Robert K. Hoyt. University Park Press, 1974.
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