Soars, J., & Soars, L. (1994). Headway: Student's book,. Oxford: Oxford University Press.
Dyfyniad Arddull ChicagoSoars, John., và Liz Soars. Headway: Student's Book,. Oxford: Oxford University Press, 1994.
Dyfyniad MLASoars, John., và Liz Soars. Headway: Student's Book,. Oxford: Oxford University Press, 1994.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.