APA (7th ed.) Zitazioa

Guffey, M. E. (1991). Essentials of business communication (2nd ed.). PWS - KENT.

Chicago Style (17th ed.) Zitazioa

Guffey, Mary E. Essentials of Business Communication. 2nd ed. Boston: PWS - KENT, 1991.

MLA (9th ed.) Zitazioa

Guffey, Mary E. Essentials of Business Communication. 2nd ed. PWS - KENT, 1991.