Cita APA (7th ed.)

Guffey, M. E., & Seefer, C. M. (2011). Business English (10/e.). South Western Cengage Learning.

Cita Chicago (17th ed.)

Guffey, Mary Ellen, i Carolyn M. Seefer. Business English. 10/e. Mason, OH: South Western Cengage Learning, 2011.

Cita MLA (9th ed.)

Guffey, Mary Ellen, i Carolyn M. Seefer. Business English. 10/e. South Western Cengage Learning, 2011.