Soars, J., & Soars, L. (2003). American Headway: Workbook 3. New York: Oxford University Press.
Dyfyniad Arddull ChicagoSoars, John, và Liz Soars. American Headway: Workbook 3. New York: Oxford University Press, 2003.
Dyfyniad MLASoars, John, và Liz Soars. American Headway: Workbook 3. New York: Oxford University Press, 2003.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.