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Dyfyniad Arddull ChicagoKeck, Leander E. Paul and His Letters. 2nd.ed. Philadelphia: Fortress, 1988.
Dyfyniad MLAKeck, Leander E. Paul and His Letters. 2nd.ed. Fortress, 1988.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.