Cita APA (7a ed.)
Soars, J., & Soars, L. (1997). Headway. Teacher's Book. Pre-intermediate (1. Edition.). The University Press.
Cita Chicago Style (17a ed.)
Soars, John, y Liz Soars. Headway. Teacher's Book. Pre-intermediate. 1. Edition. Oxford: The University Press, 1997.
Cita MLA (9a ed.)
Soars, John, y Liz Soars. Headway. Teacher's Book. Pre-intermediate. 1. Edition. The University Press, 1997.
Precaución: Estas citas no son 100% exactas.