Soars, J., & Soars, L. (1988). Headway - Upper-intermediate: Student's book. Oxford: Oxford University Press.
Stile di citazione ChicagoSoars, John, e Liz Soars. Headway - Upper-intermediate: Student's Book. Oxford: Oxford University Press, 1988.
Citazione MLASoars, John, e Liz Soars. Headway - Upper-intermediate: Student's Book. Oxford: Oxford University Press, 1988.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.