Dyfyniad APA

Martin, W. (1975). Screwtape writes again. Vision House.

Dyfyniad Arddull Chicago

Martin, Walter. Screwtape Writes Again. Santa Ana: Vision House, 1975.

Dyfyniad MLA

Martin, Walter. Screwtape Writes Again. Vision House, 1975.

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