Cita APA

Koenig, C. L., Oxenden, C., & Jane Hudson. (2013). American English file: Workbook. Oxford: Oxford University Press.

Chicago Style Citation

Koenig, Chistina Latham, Clive Oxenden, i Jane Hudson. American English File: Workbook. Oxford: Oxford University Press, 2013.

Cita MLA

Koenig, Chistina Latham, Clive Oxenden, i Jane Hudson. American English File: Workbook. Oxford: Oxford University Press, 2013.