APA (7th ed.) Citation

Soars, L., & Soars, J. (1998). New Headway English course: : upper-intermediate. Oxford University Press.

Chicago Style (17th ed.) Citation

Soars, Liz, and John Soars. New Headway English Course: : Upper-intermediate. Oxford: Oxford University Press, 1998.

MLA (9th ed.) Citation

Soars, Liz, and John Soars. New Headway English Course: : Upper-intermediate. Oxford University Press, 1998.