Cita APA (7th ed.)

Soars, J., & Soars, L. New headway English course. Oxford University Press.

Cita Chicago (17th ed.)

Soars, John, i Liz Soars. New Headway English Course. Oxford : c2000 [2001 printing]: Oxford University Press.

Cita MLA (8th ed.)

Soars, John, i Liz Soars. New Headway English Course. Oxford University Press.