Dyfyniad APA

Topia (University of Toronto Press). University of Toronto Press.

Dyfyniad Arddull Chicago

Topia (University of Toronto Press). University of Toronto Press.

Dyfyniad MLA

Topia (University of Toronto Press). University of Toronto Press.

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