Dyfyniad APA

(1997). Headway intermediate: Student's book. Oxford: Oxford Univ. Press.

Dyfyniad Arddull Chicago

Headway Intermediate: Student's Book. Oxford: Oxford Univ. Press, 1997.

Dyfyniad MLA

Headway Intermediate: Student's Book. Oxford: Oxford Univ. Press, 1997.

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