Cita APA

Soars, L., & Soars, J. (1998). New Headway English Course, Upper-Intermediate: Workbook. Oxford: Oxford University Press.

Citación estilo Chicago

Soars, Liz, y John Soars. New Headway English Course, Upper-Intermediate: Workbook. Oxford: Oxford University Press, 1998.

Cita MLA

Soars, Liz, y John Soars. New Headway English Course, Upper-Intermediate: Workbook. Oxford: Oxford University Press, 1998.