Capel, A. (2011). PET masterclass student's book (intermediate). Oxford: Oxford University Press.
शिकागो स्टाइल उद्धरणCapel, Annette. PET Masterclass Student's Book (intermediate). Oxford: Oxford University Press, 2011.
एमएलए उद्धरणCapel, Annette. PET Masterclass Student's Book (intermediate). Oxford: Oxford University Press, 2011.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.