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Dyfyniad Arddull ChicagoQuirk, John F. Quirk, John F., SJ, Papers. Washington, D.C.: DigitalGeorgetown, 2013.
Dyfyniad MLAQuirk, John F. Quirk, John F., SJ, Papers. DigitalGeorgetown, 2013.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.