APA (7e ed.) Bronvermelding
Guffey, M. E. (1998). Essentials of business communication (4th ed.). South-Western College Pub..
Chicago (17e ed.) Bronvermelding
Guffey, Mary Ellen. Essentials of Business Communication. 4th ed. Cincinnati, Ohio: South-Western College Pub., 1998.
MLA (9e ed.) Bronvermelding
Guffey, Mary Ellen. Essentials of Business Communication. 4th ed. South-Western College Pub., 1998.
Let op: Deze citaties zijn niet altijd 100% accuraat.