APA (7th ed.) Citation
Soars, J., & Soars, L. (1998). New Headway English Course. Upper-Intermediate. Student's Book. Oxford University Press.
Chicago Style (17th ed.) Citation
Soars, John, and Liz Soars. New Headway English Course. Upper-Intermediate. Student's Book. Oxford: Oxford University Press, 1998.
MLA (9th ed.) Citation
Soars, John, and Liz Soars. New Headway English Course. Upper-Intermediate. Student's Book. Oxford University Press, 1998.
Warning: These citations may not always be 100% accurate.