Cita APA (7a ed.)

Soars, L., & Soars, J. (2011). New Headway: Elementary Workbook with key (4a ed.). University Oxford.

Cita Chicago Style (17a ed.)

Soars, Liz, y John Soars. New Headway: Elementary Workbook with Key. 4a ed. Oxford: University Oxford, 2011.

Cita MLA (8a ed.)

Soars, Liz, y John Soars. New Headway: Elementary Workbook with Key. 4a ed. University Oxford, 2011.