Cita APA (7a ed.)

Trappe, T., & Tullis, G. (2011). Intelligent business: Advanced business english, Coursebook. Pearson/Longman.

Cita Chicago Style (17a ed.)

Trappe, Tonya, y Graham Tullis. Intelligent Business: Advanced Business English, Coursebook. Harlow: Pearson/Longman, 2011.

Cita MLA (9a ed.)

Trappe, Tonya, y Graham Tullis. Intelligent Business: Advanced Business English, Coursebook. Pearson/Longman, 2011.