APA ציטוט

Duckworth, M. (1999). Countdown to first certificate. Oxford: Oxford University Press.

Trích dẫn kiểu Chicago

Duckworth, Michael. Countdown to First Certificate. Oxford: Oxford University Press, 1999.

ציטוט MLA

Duckworth, Michael. Countdown to First Certificate. Oxford: Oxford University Press, 1999.