(2002). American Headway: Student book,Starter. Oxford: Oxford University Press.
Chicago Style aipamenaAmerican Headway: Student Book,Starter. Oxford: Oxford University Press, 2002.
MLA aipamenaAmerican Headway: Student Book,Starter. Oxford: Oxford University Press, 2002.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.