Guffey, M. E. (1995). Essentials of business communication (3rd ed.). South-Western College.
Chicago-Zitierstil (17. Ausg.)Guffey, Mary Ellen. Essentials of Business Communication. 3rd ed. Cincinnati, Ohio: South-Western College, 1995.
MLA-Zitierstil (9. Ausg.)Guffey, Mary Ellen. Essentials of Business Communication. 3rd ed. South-Western College, 1995.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.