Soars, J., & Soars, L. (1993). Headway: Intermediate Student"s Book&Pre-Intermediate Workbook. Oxford: Oxford University Press.
Chicago Style aipamenaSoars, John, và Liz Soars. Headway: Intermediate Student"s Book&Pre-Intermediate Workbook. Oxford: Oxford University Press, 1993.
MLA aipamenaSoars, John, và Liz Soars. Headway: Intermediate Student"s Book&Pre-Intermediate Workbook. Oxford: Oxford University Press, 1993.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.