Littlejohn, A. (1999). Cambridge English worldwide: Student's book. Cambridge, UK: Cambridge University Press.
शिकागो स्टाइल उद्धरणLittlejohn, Andrew. Cambridge English Worldwide: Student's Book. Cambridge, UK: Cambridge University Press, 1999.
एमएलए उद्धरणLittlejohn, Andrew. Cambridge English Worldwide: Student's Book. Cambridge, UK: Cambridge University Press, 1999.
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