Liz, & Soars, J. (2009). American headway: Workbook 3. New York: Oxford University Press.
Dyfyniad Arddull ChicagoLiz, và John Soars. American Headway: Workbook 3. New York: Oxford University Press, 2009.
Dyfyniad MLALiz, và John Soars. American Headway: Workbook 3. New York: Oxford University Press, 2009.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.