Oxenden, C. (2009). American English file: Student book 4. Oxford: Oxford University Press.
Trích dẫn kiểu ChicagoOxenden, Clive. American English File: Student Book 4. Oxford: Oxford University Press, 2009.
MLA引文Oxenden, Clive. American English File: Student Book 4. Oxford: Oxford University Press, 2009.
警告：這些引文格式不一定是100％准確.