Richards, J. C. (1978). Understanding second & foreign language learning: Issues & approaches. Newbury House Publishers.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रRichards, Jack C. Understanding Second & Foreign Language Learning: Issues & Approaches. Rowley, Mass: Newbury House Publishers, 1978.
एमएलए (9वां संस्करण) प्रशस्ति पत्रRichards, Jack C. Understanding Second & Foreign Language Learning: Issues & Approaches. Newbury House Publishers, 1978.
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