APA (7th ed.) Citation

Soars, L., & Soars, J. (1997). New headway english course: Intermediate workbook. Oxford University Press.

Chicago Style (17th ed.) Citation

Soars, Liz, and John Soars. New Headway English Course: Intermediate Workbook. Oxford, Inglaterra: Oxford University Press, 1997.

MLA (9th ed.) Citation

Soars, Liz, and John Soars. New Headway English Course: Intermediate Workbook. Oxford University Press, 1997.