Falla, T., Soars, J., & Soars, L. (2002). American headway starter: Workbook. Oxford: Oxford Univ. Press.
Chicago Style aipamenaFalla, Tim, John Soars, và Liz Soars. American Headway Starter: Workbook. Oxford: Oxford Univ. Press, 2002.
MLA aipamenaFalla, Tim, John Soars, và Liz Soars. American Headway Starter: Workbook. Oxford: Oxford Univ. Press, 2002.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.