APA

Oxenden C., Latham-Koenig C. & Seligson P. (2008). American English file. New York: Oxford University Press.

Chicago

Oxenden Clive, Latham-Koenig Christina and Seligson Paul. 2008. American English file. New York: Oxford University Press.

Harvard

Oxenden C., Latham-Koenig C. and Seligson P. (2008). American English file. New York: Oxford University Press.

MLA

Oxenden Clive, Latham-Koenig Christina and Seligson Paul. American English file. New York: Oxford University Press. 2008.