Dyfyniad APA

Princeton Language Institute. (1993). 21st century spelling dictionary. Dell Pub.

Dyfyniad Arddull Chicago

Princeton Language Institute. 21st Century Spelling Dictionary. New York: Dell Pub, 1993.

Dyfyniad MLA

Princeton Language Institute. 21st Century Spelling Dictionary. Dell Pub, 1993.

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