Cita APA (7a ed.)

Campbell, G. M., & Dugger, J. (2002). Business letters for busy people: Time saving, ready-to-use letters for any occasion (4th ed.). Career Press.

Cita Chicago Style (17a ed.)

Campbell, G. Michael, y Jim Dugger. Business Letters for Busy People: Time Saving, Ready-to-use Letters for Any Occasion. 4th ed. Franklin Lakes, NJ: Career Press, 2002.

Cita MLA (9a ed.)

Campbell, G. Michael, y Jim Dugger. Business Letters for Busy People: Time Saving, Ready-to-use Letters for Any Occasion. 4th ed. Career Press, 2002.