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Dyfyniad Arddull ChicagoHancock. Brainwaves: Teacher's Book Level 3. Oxford,New York: Oxford University Press, 1998.
Dyfyniad MLAHancock. Brainwaves: Teacher's Book Level 3. Oxford,New York: Oxford University Press, 1998.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.