APA (7th ed.) Citation

Soars L. Liz, Soars J. John, & Wheeldon S. Sylvia. (2007). New Headway Upper-Intermediate. Workbook with key. New York, Oxford University Press, 2007.

Chicago Style (17th ed.) Citation

Soars L. Liz, Soars J. John, and Wheeldon S. Sylvia. New Headway Upper-Intermediate. Workbook with Key. New York, Oxford University Press, 2007, 2007.

MLA (9th ed.) Citation

Soars L. Liz, et al. New Headway Upper-Intermediate. Workbook with Key. New York, Oxford University Press, 2007, 2007.