Cita APA (7a ed.)

Trappe, T., & Tullis, G. (2008). Intelligent business: Intermediate business English. Coursebook (1st published, 4th imp.). Pearson Education.

Cita Chicago Style (17a ed.)

Trappe, Tonya, y Graham Tullis. Intelligent Business: Intermediate Business English. Coursebook. 1st published, 4th imp. Harlow: Pearson Education, 2008.

Cita MLA (9a ed.)

Trappe, Tonya, y Graham Tullis. Intelligent Business: Intermediate Business English. Coursebook. 1st published, 4th imp. Pearson Education, 2008.