Guffey, M. E. (1995). Essentials of business communication (3rd ed.). South-Western College.
Citação norma ChicagoGuffey, Mary Ellen. Essentials of Business Communication. 3rd ed. Cincinnati, Ohio: South-Western College, 1995.
Citação norma MLAGuffey, Mary Ellen. Essentials of Business Communication. 3rd ed. South-Western College, 1995.
Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.