Koenig, C. L., & Oxenden, C. (2013). American English file: Teacher's book. Oxford: Oxford University Press.
Trích dẫn kiểu ChicagoKoenig, Chistina Latham, và Clive Oxenden. American English File: Teacher's Book. Oxford: Oxford University Press, 2013.
Deismireacht MLAKoenig, Chistina Latham, và Clive Oxenden. American English File: Teacher's Book. Oxford: Oxford University Press, 2013.
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