APA Citatie

Duckworth, M. (2008). Countdown to first certificate: (Workbook with key). Oxford: Oxford University Press.

Chicago Style citaat

Duckworth, Michael. Countdown to First Certificate: (Workbook With Key). Oxford: Oxford University Press, 2008.

MLA citatie

Duckworth, Michael. Countdown to First Certificate: (Workbook With Key). Oxford: Oxford University Press, 2008.

Let op: Deze citaties zijn niet altijd 100% accuraat.