Citazione Stile APA (7a Edizione)
Guffey, M. E. (1998). Essentials of business communication (4th ed.). South-Western College Pub..
Citazione stile Chigago Style (17a edizione)
Guffey, Mary Ellen. Essentials of Business Communication. 4th ed. Cincinnati, Ohio: South-Western College Pub., 1998.
Citatione MLA (9a ed.)
Guffey, Mary Ellen. Essentials of Business Communication. 4th ed. South-Western College Pub., 1998.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.