Guffey, M. E., & Seefer, C. M. (2010). Mary Ellen Guffey's essentials of business communication (8th ed.). Thomson/South-Western.
Chicago-Zitierstil (17. Ausg.)Guffey, Mary Ellen, und Carolyn M. Seefer. Mary Ellen Guffey's Essentials of Business Communication. 8th ed. Mason, OH: Thomson/South-Western, 2010.
MLA-Zitierstil (9. Ausg.)Guffey, Mary Ellen, und Carolyn M. Seefer. Mary Ellen Guffey's Essentials of Business Communication. 8th ed. Thomson/South-Western, 2010.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.