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Dyfyniad Arddull ChicagoDurability of Disease Resistance. The Netherland: Kluwer Academic Publishers, 1993.
Dyfyniad MLADurability of Disease Resistance. The Netherland: Kluwer Academic Publishers, 1993.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.