Trappe, T., & Tullis, G. (2005). Intelligent Business Intermediate Coursebook. England: Pearson Education Limit.
Trích dẫn kiểu ChicagoTrappe, Tonya, và Graham Tullis. Intelligent Business Intermediate Coursebook. England: Pearson Education Limit, 2005.
Deismireacht MLATrappe, Tonya, và Graham Tullis. Intelligent Business Intermediate Coursebook. England: Pearson Education Limit, 2005.
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