Cita APA (7a ed.)

Guffey, M. E., & Seefer, C. M. (2010). Mary Ellen Guffey's essentials of business communication (8th ed.). Thomson/South-Western.

Cita Chicago Style (17a ed.)

Guffey, Mary Ellen, y Carolyn M. Seefer. Mary Ellen Guffey's Essentials of Business Communication. 8th ed. Mason, OH: Thomson/South-Western, 2010.

Cita MLA (9a ed.)

Guffey, Mary Ellen, y Carolyn M. Seefer. Mary Ellen Guffey's Essentials of Business Communication. 8th ed. Thomson/South-Western, 2010.