APA (7th ed.) Zitazioa

Soars, L., Soars, L., & Sayer, M. (2010). American Headway 4: The world's most trusted English course. Teacher's book (2a. ed.). Oxford University Press.

Chicago Style (17th ed.) Zitazioa

Soars, Liz, Liz Soars, eta Mike Sayer. American Headway 4: The World's Most Trusted English Course. Teacher's Book. 2a. ed. Nueva York: Oxford University Press, 2010.

MLA (9th ed.) Zitazioa

Soars, Liz, et al. American Headway 4: The World's Most Trusted English Course. Teacher's Book. 2a. ed. Oxford University Press, 2010.