Cita APA (7a ed.)
Soars, J., & Soars, L. (1989). Headway. Student's Book: Advanced (9.impression.). Oxford University Press.
Cita Chicago Style (17a ed.)
Soars, John, y Liz Soars. Headway. Student's Book: Advanced. 9.impression. Oxford: Oxford University Press, 1989.
Cita MLA (9a ed.)
Soars, John, y Liz Soars. Headway. Student's Book: Advanced. 9.impression. Oxford University Press, 1989.
Precaución: Estas citas no son 100% exactas.