Oxenden, C., & Latham Koenig, C. (2001). English file Upper intermediate: Class Audio CDs. Oxford: Oxford University Press.
Citación estilo ChicagoOxenden, Clive, and Christina Latham Koenig. English File Upper Intermediate: Class Audio CDs. Oxford: Oxford University Press, 2001.
Cita MLAOxenden, Clive, and Christina Latham Koenig. English File Upper Intermediate: Class Audio CDs. Oxford: Oxford University Press, 2001.
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