Soars, J., & Soars, L. (1988). Headway - Upper-intermediate: Student's book. Oxford: Oxford University Press.
Dyfyniad Arddull ChicagoSoars, John, và Liz Soars. Headway - Upper-intermediate: Student's Book. Oxford: Oxford University Press, 1988.
Dyfyniad MLASoars, John, và Liz Soars. Headway - Upper-intermediate: Student's Book. Oxford: Oxford University Press, 1988.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.