Cita APA

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

Chicago Style Citation

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

Cita MLA

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

Atenció: Aquestes cites poden no estar 100% correctes.