Cita APA

Soars, J., & Soars, L. (1986). Headway: Workbook, Upper-Intermediate. Oxford: Oxford University Press.

Citación estilo Chicago

Soars, John., y Liz Soars. Headway: Workbook, Upper-Intermediate. Oxford: Oxford University Press, 1986.

Cita MLA

Soars, John., y Liz Soars. Headway: Workbook, Upper-Intermediate. Oxford: Oxford University Press, 1986.