Guffey, M. E., & Seefer, C. M. (2010). Mary Ellen Guffey's essentials of business communication (8th ed.). Thomson/South-Western.
Cita Chicago Style (17a ed.)Guffey, Mary Ellen, y Carolyn M. Seefer. Mary Ellen Guffey's Essentials of Business Communication. 8th ed. Mason, OH: Thomson/South-Western, 2010.
Cita MLA (9a ed.)Guffey, Mary Ellen, y Carolyn M. Seefer. Mary Ellen Guffey's Essentials of Business Communication. 8th ed. Thomson/South-Western, 2010.
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