APA (7th ed.) Citation

Oxenden, C., & Latham Koenig, C. (2001). English file Upper intermediate: Class Audio CDs. Oxford University Press.

Chicago Style (17th ed.) Citation

Oxenden, Clive, and Christina Latham Koenig. English File Upper Intermediate: Class Audio CDs. Oxford: Oxford University Press, 2001.

MLA (9th ed.) Citation

Oxenden, Clive, and Christina Latham Koenig. English File Upper Intermediate: Class Audio CDs. Oxford University Press, 2001.