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Dyfyniad Arddull ChicagoAmerican Headway 1: (Workbook). Oxford: Oxford University Press, 2001.
Dyfyniad MLAAmerican Headway 1: (Workbook). Oxford: Oxford University Press, 2001.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.