Cita APA

Soars, J., & Soars, L. (1989). Headway advanced: Student's Book. New York: Oxford University Press.

Citación estilo Chicago

Soars, John, y Liz Soars. Headway Advanced: Student's Book. New York: Oxford University Press, 1989.

Cita MLA

Soars, John, y Liz Soars. Headway Advanced: Student's Book. New York: Oxford University Press, 1989.