Dyfyniad APA

Wyatt, R., Duckworth, M., & Gude, K. (1999). Countdown to first certificate (2nd ed.). Oxford: Oxford U. P..

Dyfyniad Arddull Chicago

Wyatt, Rawdon, Michael Duckworth, và Kathy Gude. Countdown to First Certificate. 2nd ed. Oxford: Oxford U. P., 1999.

Dyfyniad MLA

Wyatt, Rawdon, Michael Duckworth, và Kathy Gude. Countdown to First Certificate. 2nd ed. Oxford: Oxford U. P., 1999.

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