Dyfyniad APA

(1991). The Oxford library of English usage. Oxford University Press.

Dyfyniad Arddull Chicago

The Oxford Library of English Usage. Oxford: Oxford University Press, 1991.

Dyfyniad MLA

The Oxford Library of English Usage. Oxford University Press, 1991.

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