Cita APA (7a ed.)

Cunnngham S. Sarah & Bowler B. Bill. (1996). Headway. Intermediate; Pronunciation. Oxford, Oxford University Press, 1996.

Cita Chicago Style (17a ed.)

Cunnngham S. Sarah y Bowler B. Bill. Headway. Intermediate; Pronunciation. Oxford, Oxford University Press, 1996, 1996.

Cita MLA (9a ed.)

Cunnngham S. Sarah y Bowler B. Bill. Headway. Intermediate; Pronunciation. Oxford, Oxford University Press, 1996, 1996.