Oxenden, C. (1997). English file: Workbook. Oxford: Oxford University Press.
Dyfyniad Arddull ChicagoOxenden, Clive. English File: Workbook. Oxford: Oxford University Press, 1997.
Dyfyniad MLAOxenden, Clive. English File: Workbook. Oxford: Oxford University Press, 1997.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.