APA (7th ed.) Citation

Soars, J., Soars, L., & Falla, T. (2010). American headway: Starter workbook (Segunda edición.). Oxford University Press.

Chicago Style (17th ed.) Citation

Soars, John, Liz Soars, and Tim Falla. American Headway: Starter Workbook. Segunda edición. New York: Oxford University Press, 2010.

MLA (9th ed.) Citation

Soars, John, et al. American Headway: Starter Workbook. Segunda edición. Oxford University Press, 2010.