Trappe, T., & Tullis, G. (2005). Intelligent Business Upper Intermediate Coursebook. England: Pearson Education Limit.
Stile di citazione ChicagoTrappe, Tonya, e Graham Tullis. Intelligent Business Upper Intermediate Coursebook. England: Pearson Education Limit, 2005.
Citazione MLATrappe, Tonya, e Graham Tullis. Intelligent Business Upper Intermediate Coursebook. England: Pearson Education Limit, 2005.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.