Littlejohn, A. (2000). Cambridge English worldwide: Listening and speaking pack. Cambridge, UK: Cambridge University Press.
शिकागो स्टाइल उद्धरणLittlejohn, Andrew. Cambridge English Worldwide: Listening and Speaking Pack. Cambridge, UK: Cambridge University Press, 2000.
एमएलए उद्धरणLittlejohn, Andrew. Cambridge English Worldwide: Listening and Speaking Pack. Cambridge, UK: Cambridge University Press, 2000.
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