Dyfyniad APA

Bowler, B., & Cunningham, S. (1991). Headway, Upper-Intermediate: Pronunciation. Oxford: Oxford University Press.

Dyfyniad Arddull Chicago

Bowler, Bill, và Sarah Cunningham. Headway, Upper-Intermediate: Pronunciation. Oxford: Oxford University Press, 1991.

Dyfyniad MLA

Bowler, Bill, và Sarah Cunningham. Headway, Upper-Intermediate: Pronunciation. Oxford: Oxford University Press, 1991.

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