Cita APA

Koenig, C. L., & Oxenden, C. (2013). American English file: Online practice. Oxford: Oxford University Press.

Chicago Style Citation

Koenig, Chistina Latham, i Clive Oxenden. American English File: Online Practice. Oxford: Oxford University Press, 2013.

Cita MLA

Koenig, Chistina Latham, i Clive Oxenden. American English File: Online Practice. Oxford: Oxford University Press, 2013.

Atenció: Aquestes cites poden no estar 100% correctes.