Dyfyniad APA

edited by Patricia Byrd. Meterial writer's guide. New York: Heinle & Heinle.

Dyfyniad Arddull Chicago

edited by Patricia Byrd. Meterial Writer's Guide. New York: Heinle & Heinle.

Dyfyniad MLA

edited by Patricia Byrd. Meterial Writer's Guide. New York: Heinle & Heinle.

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