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 CitationOxenden, Clive. American English File: Student Book 4. Oxford: Oxford University Press, 2009.
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