Cita APA (7th ed.)
Guffey, M. E. (1991). Essentials of business communication. Mason, OH.
Cita Chicago (17th ed.)
Guffey, Mary E. Essentials of Business Communication. London: Mason, OH, 1991.
Cita MLA (9th ed.)
Guffey, Mary E. Essentials of Business Communication. Mason, OH, 1991.
Atenció: Aquestes cites poden no estar 100% correctes.