Jack C.Richards. (2004). Connect 4: Student's book. Cambridge: Cambridge University Press.
शिकागो स्टाइल उद्धरणJack C.Richards. Connect 4: Student's Book. Cambridge: Cambridge University Press, 2004.
एमएलए उद्धरणJack C.Richards. Connect 4: Student's Book. Cambridge: Cambridge University Press, 2004.
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