APA引文

Duckworth M. Michael & Gude K. Kathy. (2008). Countdown to first certificate: Class CD. New York, Oxford University Press, 2008.

Chicago Style (17th ed.) Citation

Duckworth M. Michael and Gude K. Kathy. Countdown to First Certificate: Class CD. New York, Oxford University Press, 2008, 2008.

MLA引文

Duckworth M. Michael and Gude K. Kathy. Countdown to First Certificate: Class CD. New York, Oxford University Press, 2008, 2008.

警告：這些引文格式不一定是100％准確.