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Dyfyniad Arddull ChicagoRing Theory: Proceedings of the 1978 Antwerp Conference. New York: Marcel Dekker, 1979.
Dyfyniad MLARing Theory: Proceedings of the 1978 Antwerp Conference. New York: Marcel Dekker, 1979.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.