Cita APA

Soars, J., & Soars, L. (1987). Headway, Upper-Intermediate: Workbook. Oxford: Oxford University Press.

Chicago Style Citation

Soars, John, i Liz Soars. Headway, Upper-Intermediate: Workbook. Oxford: Oxford University Press, 1987.

Cita MLA

Soars, John, i Liz Soars. Headway, Upper-Intermediate: Workbook. Oxford: Oxford University Press, 1987.