APA (7th ed.) Citation
Soars, J., & Soars, L. (1999). Headway. Teacher's Book. Pre-Intermediate. The University Press.
Chicago Style (17th ed.) Citation
Soars, John, and Liz Soars. Headway. Teacher's Book. Pre-Intermediate. Oxford: The University Press, 1999.
MLA (9th ed.) Citation
Soars, John, and Liz Soars. Headway. Teacher's Book. Pre-Intermediate. The University Press, 1999.
Warning: These citations may not always be 100% accurate.