Cita APA (7a ed.)

Trappe, T., & Tullis, G. (2005). Intelligent business: Coursebook : upper Intermediate business english [Audio CD 1]. Longman.

Cita Chicago Style (17a ed.)

Trappe, Tonya, y Graham Tullis. Intelligent Business: Coursebook : Upper Intermediate Business English [Audio CD 1]. London: Longman, 2005.

Cita MLA (9a ed.)

Trappe, Tonya, y Graham Tullis. Intelligent Business: Coursebook : Upper Intermediate Business English [Audio CD 1]. Longman, 2005.