Citazione APA

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

Stile di citazione Chicago

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

Citazione MLA

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

Attenzione: Queste citazioni potrebbero non essere precise al 100%.