APA (7th ed.) Citation
Soars, J., & Soars, L. (1994). Headway. Workbook: Upper-Intermediate (16.impression.). Oxford University Press.
Chicago Style (17th ed.) Citation
Soars, John, and Liz Soars. Headway. Workbook: Upper-Intermediate. 16.impression. Oxford: Oxford University Press, 1994.
MLA (9th ed.) Citation
Soars, John, and Liz Soars. Headway. Workbook: Upper-Intermediate. 16.impression. Oxford University Press, 1994.
Warning: These citations may not always be 100% accurate.