APA (7th ed.) Citation

Soars, J., Soars, L., & Falla, T. (2002). American headway starter: Workbook. Oxford University Press.

Chicago Style (17th ed.) Citation

Soars, John, Liz Soars, and Tim Falla. American Headway Starter: Workbook. Oxford: Oxford University Press, 2002.

MLA (9th ed.) Citation

Soars, John, et al. American Headway Starter: Workbook. Oxford University Press, 2002.