APA (7th ed.) Citation
Soars, J., & Soars, L. (1989). Headway. Student's Book: Advanced (9.impression.). Oxford University Press.
Chicago Style (17th ed.) Citation
Soars, John, and Liz Soars. Headway. Student's Book: Advanced. 9.impression. Oxford: Oxford University Press, 1989.
MLA (9th ed.) Citation
Soars, John, and Liz Soars. Headway. Student's Book: Advanced. 9.impression. Oxford University Press, 1989.
Warning: These citations may not always be 100% accurate.