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Dyfyniad Arddull ChicagoLessons in the Catholic Faith. [1993 updated edition]. Santa Monica, California: Veritas Press, 1993.
Dyfyniad MLALessons in the Catholic Faith. [1993 updated edition]. Veritas Press, 1993.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.