(2003). American headway; workbook - 3. Oxford: Oxford University Press.
Chicago Style aipamenaAmerican Headway; Workbook - 3. Oxford: Oxford University Press, 2003.
MLA aipamenaAmerican Headway; Workbook - 3. Oxford: Oxford University Press, 2003.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.