Soars, J., & Soars, L. (1991). Headway: Pre-Intermediate : Student's Book. Oxford: Oxford University Press.
Stile di citazione ChicagoSoars, John, e Liz Soars. Headway: Pre-Intermediate : Student's Book. Oxford: Oxford University Press, 1991.
Citazione MLASoars, John, e Liz Soars. Headway: Pre-Intermediate : Student's Book. Oxford: Oxford University Press, 1991.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.