Dyfyniad APA

(1986). A university grammar of English: Workbook. Longman.

Dyfyniad Arddull Chicago

A University Grammar of English: Workbook. Longman, 1986.

Dyfyniad MLA

A University Grammar of English: Workbook. Longman, 1986.

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