Soars, J. (1991). Headway Pre-intermediate: Teacher's book. Oxford: Oxford University Press.
Παραπομπή Chicago StyleSoars, John. Headway Pre-intermediate: Teacher's Book. Oxford: Oxford University Press, 1991.
Παραπομπή MLASoars, John. Headway Pre-intermediate: Teacher's Book. Oxford: Oxford University Press, 1991.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.