APA aipamena

(1987). Headway workbook: Upper-intermediate. Oxford: Oxford Univ. Press.

Chicago Style aipamena

Headway Workbook: Upper-intermediate. Oxford: Oxford Univ. Press, 1987.

MLA aipamena

Headway Workbook: Upper-intermediate. Oxford: Oxford Univ. Press, 1987.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.