Soars, J., & Soars, L. (1987). Headway: Student's book. Upper-intemediate. Oxford University Press.
Cita Chicago Style (17a ed.)Soars, John, y Liz Soars. Headway: Student's Book. Upper-intemediate. Oxford: Oxford University Press, 1987.
Cita MLA (9a ed.)Soars, John, y Liz Soars. Headway: Student's Book. Upper-intemediate. Oxford University Press, 1987.
Precaución: Estas citas no son 100% exactas.