Cita APA (7a ed.)

Soars, L., & Soars, J. (2003). New Headway: Intermediate workbook with key (3rd ed.). Oxford University Press.

Cita Chicago Style (17a ed.)

Soars, Liz, y John Soars. New Headway: Intermediate Workbook with Key. 3rd ed. Oxford: Oxford University Press, 2003.

Cita MLA (8a ed.)

Soars, Liz, y John Soars. New Headway: Intermediate Workbook with Key. 3rd ed. Oxford University Press, 2003.