APA (7th ed.) Citation
Soars, J., & Soars, L. (1991). Headway. Workbook: Advanced (4.impression.). Oxford University Press.
Chicago Style (17th ed.) Citation
Soars, John, and Liz Soars. Headway. Workbook: Advanced. 4.impression. Oxford: Oxford University Press, 1991.
MLA (9th ed.) Citation
Soars, John, and Liz Soars. Headway. Workbook: Advanced. 4.impression. Oxford University Press, 1991.
Warning: These citations may not always be 100% accurate.