Citazione Stile APA (7a Edizione)

Guffey, M. E. (1995). Essentials of business communication (3rd ed.). South-Western College.

Citazione stile Chigago Style (17a edizione)

Guffey, Mary Ellen. Essentials of Business Communication. 3rd ed. Cincinnati, Ohio: South-Western College, 1995.

Citatione MLA (9a ed.)

Guffey, Mary Ellen. Essentials of Business Communication. 3rd ed. South-Western College, 1995.