Soars, J., & Soars, L. (1987). Headway upper - intermediate: Teacher's book. New York: Oxford University Press.
Dyfyniad Arddull ChicagoSoars, John, và Liz Soars. Headway Upper - Intermediate: Teacher's Book. New York: Oxford University Press, 1987.
Dyfyniad MLASoars, John, và Liz Soars. Headway Upper - Intermediate: Teacher's Book. New York: Oxford University Press, 1987.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.