Cita APA

Duckworth, M. (2009). Countdown to first certificate. Oxford: Oxford University Press.

Chicago Style Citation

Duckworth, Michael. Countdown to First Certificate. Oxford: Oxford University Press, 2009.

Cita MLA

Duckworth, Michael. Countdown to First Certificate. Oxford: Oxford University Press, 2009.

Atenció: Aquestes cites poden no estar 100% correctes.