APA (7th ed.) Zitazioa
Soars, L., & Soars, J. (2011). New headway elementary student's book (4th ed.). Oxford University Press.
Chicago Style (17th ed.) Zitazioa
Soars, Liz, eta John Soars. New Headway Elementary Student's Book. 4th ed. Oxford: Oxford University Press, 2011.
MLA (9th ed.) Zitazioa
Soars, Liz, eta John Soars. New Headway Elementary Student's Book. 4th ed. Oxford University Press, 2011.
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