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Dyfyniad Arddull ChicagoJones, Leo. New International Business English: Workbook. Cambridge: Cambridge University, 2000.
Dyfyniad MLAJones, Leo. New International Business English: Workbook. Cambridge: Cambridge University, 2000.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.