Koenig, C. L., Oxenden, C., & Paul Seligson. (2013). American English file: Workbook. Oxford: Oxford University Press.
Trích dẫn kiểu ChicagoKoenig, Chistina Latham, Clive Oxenden, và Paul Seligson. American English File: Workbook. Oxford: Oxford University Press, 2013.
MLA引文Koenig, Chistina Latham, Clive Oxenden, và Paul Seligson. American English File: Workbook. Oxford: Oxford University Press, 2013.
警告：这些引文格式不一定是100％准确.