Cita APA (7a ed.)

Soars, L., & Soars, J. (1987). Headway: : upper-intermediate. Oxford University Press.

Cita Chicago Style (17a ed.)

Soars, Liz, y John Soars. Headway: : Upper-intermediate. Oxford: Oxford University Press, 1987.

Cita MLA (9a ed.)

Soars, Liz, y John Soars. Headway: : Upper-intermediate. Oxford University Press, 1987.