APA (7th ed.) Citation

Oxenden, C., Hudson, J., & Latham Koenig, C. (2002). English file Upper intermediate: Workbook. Oxford University Press.

Chicago Style (17th ed.) Citation

Oxenden, Clive, Jane Hudson, and Christina Latham Koenig. English File Upper Intermediate: Workbook. Oxford: Oxford University Press, 2002.

MLA (9th ed.) Citation

Oxenden, Clive, et al. English File Upper Intermediate: Workbook. Oxford University Press, 2002.