APA (7th ed.) Citation

Oxeden, C., Latham-Koening, C., Seligson, P., & Hudson, J. (2008). American English File: Workbook 1. Oxford University Press.

Chicago Style (17th ed.) Citation

Oxeden, Clive, Christina Latham-Koening, Paul Seligson, and Jane Hudson. American English File: Workbook 1. New York: Oxford University Press, 2008.

MLA (9th ed.) Citation

Oxeden, Clive, et al. American English File: Workbook 1. Oxford University Press, 2008.