APA引文

Michael Duckworth. (1999). Countdown to first certificate ( Teacher's book ). Oxford: Oxford Univ. Press.

Trích dẫn kiểu Chicago

Michael Duckworth. Countdown to First Certificate ( Teacher's Book ). Oxford: Oxford Univ. Press, 1999.

MLA引文

Michael Duckworth. Countdown to First Certificate ( Teacher's Book ). Oxford: Oxford Univ. Press, 1999.

警告：这些引文格式不一定是100％准确.