Cita APA (7a ed.)

Soars, J., & Soars, L. (1988). Headway: Teacher's Book Upper-Intermediate (2nd impression.). Oxford University Press.

Cita Chicago Style (17a ed.)

Soars, John, y Liz Soars. Headway: Teacher's Book Upper-Intermediate. 2nd impression. Oxford: Oxford University Press, 1988.

Cita MLA (9a ed.)

Soars, John, y Liz Soars. Headway: Teacher's Book Upper-Intermediate. 2nd impression. Oxford University Press, 1988.