(2003). American Headway 3: Student book. Oxford: Oxford University Press.
Chicago Style aipamenaAmerican Headway 3: Student Book. Oxford: Oxford University Press, 2003.
MLA aipamenaAmerican Headway 3: Student Book. Oxford: Oxford University Press, 2003.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.