Cita APA

Duckworth, M. (1999). Countdown to first certificate. Oxford: Oxford University Press.

Chicago Style Citation

Duckworth, Michael. Countdown to First Certificate. Oxford: Oxford University Press, 1999.

Cita MLA

Duckworth, Michael. Countdown to First Certificate. Oxford: Oxford University Press, 1999.

Atenció: Aquestes cites poden no estar 100% correctes.