Koenig, C. L., Oxenden, C., & Boyle, M. (2013). American English file: Workbook. Oxford: Oxford University Press.
Trích dẫn kiểu ChicagoKoenig, Chistina Latham, Clive Oxenden, và Mike Boyle. American English File: Workbook. Oxford: Oxford University Press, 2013.
MLA CitationKoenig, Chistina Latham, Clive Oxenden, và Mike Boyle. American English File: Workbook. Oxford: Oxford University Press, 2013.
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