Cita APA (7a ed.)
Soars, J. a. L. (1991). Headway. Advanced: Student's Book (5.impression.). Oxford University Press.
Cita Chicago Style (17a ed.)
Soars, John and Liz. Headway. Advanced: Student's Book. 5.impression. Oxford: Oxford University Press, 1991.
Cita MLA (9a ed.)
Soars, John and Liz. Headway. Advanced: Student's Book. 5.impression. Oxford University Press, 1991.
Precaución: Estas citas no son 100% exactas.