Cita APA (7a ed.)

Guffey, M. E. (2004). Essentials of business communication (6th ed.). South-Western College Publishing.

Cita Chicago Style (17a ed.)

Guffey, Mary Ellen. Essentials of Business Communication. 6th ed. Australia, [etc.]: South-Western College Publishing, 2004.

Cita MLA (9a ed.)

Guffey, Mary Ellen. Essentials of Business Communication. 6th ed. South-Western College Publishing, 2004.