Dyfyniad APA

(2001). American headway 1: Workbook. Oxford: Oxford University Press.

Dyfyniad Arddull Chicago

American Headway 1: Workbook. Oxford: Oxford University Press, 2001.

Dyfyniad MLA

American Headway 1: Workbook. Oxford: Oxford University Press, 2001.

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