Cita APA

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

Chicago Style Citation

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

Cita MLA

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

Atenció: Aquestes cites poden no estar 100% correctes.