Cita APA

Soars, J., & Soars, L. (1987). Headway upper - intermediate: Student's Book. New York: Oxford University Press.

Citación estilo Chicago

Soars, John, y Liz Soars. Headway Upper - Intermediate: Student's Book. New York: Oxford University Press, 1987.

Cita MLA

Soars, John, y Liz Soars. Headway Upper - Intermediate: Student's Book. New York: Oxford University Press, 1987.