Soars, J., & Soars, L. (2001). American Headway: Workbook 2. New York: Oxford University Press.
Dyfyniad Arddull ChicagoSoars, John, và Liz Soars. American Headway: Workbook 2. New York: Oxford University Press, 2001.
Dyfyniad MLASoars, John, và Liz Soars. American Headway: Workbook 2. New York: Oxford University Press, 2001.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.