Cita APA (7a ed.)

Soars, J., & Soars, L. (1991). Headway advanced. Oxford University Press.

Cita Chicago Style (17a ed.)

Soars, John, y Liz Soars. Headway Advanced. Oxford: Oxford University Press, 1991.

Cita MLA (8a ed.)

Soars, John, y Liz Soars. Headway Advanced. Oxford University Press, 1991.