Soars, L., & Soars, J. (2001). American headway: Workbook 2. Oxford: Oxford Univ. Press.
Chicago Style aipamenaSoars, Liz, và John Soars. American Headway: Workbook 2. Oxford: Oxford Univ. Press, 2001.
MLA aipamenaSoars, Liz, và John Soars. American Headway: Workbook 2. Oxford: Oxford Univ. Press, 2001.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.