APA-referens (7:e uppl.)
Guffey, M. E. (1998). Essentials of business communication (4th ed.). South-Western College Pub..
Chicago-referens (17:e uppl.)
Guffey, Mary Ellen. Essentials of Business Communication. 4th ed. Cincinnati, Ohio: South-Western College Pub., 1998.
MLA-referens (9:e uppl.)
Guffey, Mary Ellen. Essentials of Business Communication. 4th ed. South-Western College Pub., 1998.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.