Guffey, M. E. (2016). Essentials of business communication (Tenth edition.). Cengage Learning.
Citazione stile Chigago Style (17a edizione)Guffey, Mary Ellen. Essentials of Business Communication. Tenth edition. Boston, MA: Cengage Learning, 2016.
Citatione MLA (9a ed.)Guffey, Mary Ellen. Essentials of Business Communication. Tenth edition. Cengage Learning, 2016.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.