Dyfyniad APA

Duckworth M. Michael, Gude K. Kathy, & Quintana J. Jenny. (2008). Countdown to First Certificate. Workbook with Key. New York, Oxford University Press, 2008.

Dyfyniad Arddull Chicago

Duckworth M. Michael, Gude K. Kathy, and Quintana J. Jenny. Countdown to First Certificate. Workbook with Key. New York, Oxford University Press, 2008, 2008.

Dyfyniad MLA

Duckworth M. Michael, et al. Countdown to First Certificate. Workbook with Key. New York, Oxford University Press, 2008, 2008.

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