APA (7th ed.) Citation
Soars, J., Soars, L., & Wheeldon, S. American Headway: Workbook 4. Oxford University.
Chicago Style (17th ed.) Citation
Soars, John, Liz Soars, and Sylvia Wheeldon. American Headway: Workbook 4. Nueva York, EUA: Oxford University.
MLA (9th ed.) Citation
Soars, John, et al. American Headway: Workbook 4. Oxford University.
Warning: These citations may not always be 100% accurate.