APA aipamena

(1990). Headway: Advanced (Student's book). Oxford: Oxford Univ. Press.

Chicago Style aipamena

Headway: Advanced (Student's Book). Oxford: Oxford Univ. Press, 1990.

MLA aipamena

Headway: Advanced (Student's Book). Oxford: Oxford Univ. Press, 1990.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.