APA (7th ed.) Zitazioa

Soars, L., & Soars, J. (1998). New Headway: English course, Upper intermediate Student's book. Oxford University Press.

Chicago Style (17th ed.) Zitazioa

Soars, Liz, eta John Soars. New Headway: English Course, Upper Intermediate Student's Book. Oxford: Oxford University Press, 1998.

MLA (9th ed.) Zitazioa

Soars, Liz, eta John Soars. New Headway: English Course, Upper Intermediate Student's Book. Oxford University Press, 1998.