Richards, J. C. (1999). New Interchange: English for International Commucation / Jack C Richards. Cambridge University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रRichards, Jack C. New Interchange: English for International Commucation / Jack C Richards. Cambridge University Press, 1999.
एमएलए (8वां संस्करण) प्रशस्ति पत्रRichards, Jack C. New Interchange: English for International Commucation / Jack C Richards. Cambridge University Press, 1999.
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