Style de citation APA (7e éd.)

Duckworth M. Michael, Gude K. Kathy, & Quintana J. Jenny. (2008). Countdown to First Certificate. Teacher`s Book. New York, Oxford University Press, 2008.

Style de citation Chicago (17e éd.)

Duckworth M. Michael, Gude K. Kathy, et Quintana J. Jenny. Countdown to First Certificate. Teacher`s Book. New York, Oxford University Press, 2008, 2008.

Style de citation MLA (9e éd.)

Duckworth M. Michael, et al. Countdown to First Certificate. Teacher`s Book. New York, Oxford University Press, 2008, 2008.