Dyfyniad APA

 Trappe, T. (2005).  Intelligent Business: Coursebook. Intermediate Business English.  Pearson Education Limited.

Dyfyniad Arddull Chicago

 Trappe, Tonya.  Intelligent Business: Coursebook. Intermediate Business English.  Pearson Education Limited, 2005.

Dyfyniad MLA

 Trappe, Tonya.  Intelligent Business: Coursebook. Intermediate Business English.  Pearson Education Limited, 2005.

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