Cita APA (7a ed.)

Soars, J., & Soars, L. (2009). New Headway: Upper-Intermediate : Worbook with key (New Edition.). Oxford University Press.

Cita Chicago Style (17a ed.)

Soars, John, y Liz Soars. New Headway: Upper-Intermediate : Worbook with Key. New Edition. New York: Oxford University Press, 2009.

Cita MLA (9a ed.)

Soars, John, y Liz Soars. New Headway: Upper-Intermediate : Worbook with Key. New Edition. Oxford University Press, 2009.