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Dyfyniad Arddull ChicagoWheeler, Gloria. Paradox 3.5: Self-teaching Guide. Nueva York: John Wiley, 1991.
Dyfyniad MLAWheeler, Gloria. Paradox 3.5: Self-teaching Guide. John Wiley, 1991.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.