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Dyfyniad Arddull ChicagoCollins,Tim. Correct Your English Errors. New Delhi: Tata McGraw-Hill, 2009.
Dyfyniad MLACollins,Tim. Correct Your English Errors. Tata McGraw-Hill, 2009.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.