Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.