Dyfyniad APA

Lewis, C. (2001). The Screwtape letters: Screwtape proposes a toast. Harper One.

Dyfyniad Arddull Chicago

Lewis, C.S. The Screwtape Letters: Screwtape Proposes a Toast. New York: Harper One, 2001.

Dyfyniad MLA

Lewis, C.S. The Screwtape Letters: Screwtape Proposes a Toast. Harper One, 2001.

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