APA (7th ed.) Citation

Oxenden, C., Foley, M., & Seligson, P. (2002). English file 1: Workbook. Oxford University Press.

Chicago Style (17th ed.) Citation

Oxenden, Clive, Mark Foley, and Paul Seligson. English File 1: Workbook. Oxford: Oxford University Press, 2002.

MLA (9th ed.) Citation

Oxenden, Clive, et al. English File 1: Workbook. Oxford University Press, 2002.