Swan, M. (2005). Practical English usage: International student's edition. Oxford: Oxford University Press.
शिकागो स्टाइल उद्धरणSwan, Michael. Practical English Usage: International Student's Edition. Oxford: Oxford University Press, 2005.
एमएलए उद्धरणSwan, Michael. Practical English Usage: International Student's Edition. Oxford: Oxford University Press, 2005.
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