APA引文

Duckworth, M. (2008). Countdown to first certificate (workbook CD). Oxford: Oxford University Press.

Trích dẫn kiểu Chicago

Duckworth, Michael. Countdown to First Certificate (workbook CD). Oxford: Oxford University Press, 2008.

MLA引文

Duckworth, Michael. Countdown to First Certificate (workbook CD). Oxford: Oxford University Press, 2008.

警告：這些引文格式不一定是100％准確.