Richards, J. C. (1991). Interchange: English for international communication. Cambridge: Cambridge University Press.
शिकागो स्टाइल उद्धरणRichards, Jack C. Interchange: English for International Communication. Cambridge: Cambridge University Press, 1991.
एमएलए उद्धरणRichards, Jack C. Interchange: English for International Communication. Cambridge: Cambridge University Press, 1991.
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