Dyfyniad APA

World Book, I. (2004). The World Book encyclopedia. Chicago, Illinois: World Book.

Dyfyniad Arddull Chicago

World Book, Inc. The World Book Encyclopedia. Chicago, Illinois: World Book, 2004.

Dyfyniad MLA

World Book, Inc. The World Book Encyclopedia. Chicago, Illinois: World Book, 2004.

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