Guffey, M. E., & Seefer, C. M. (2010). Mary Ellen Guffey's essentials of business communication (8th ed.). Thomson/South-Western.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGuffey, Mary Ellen, और Carolyn M. Seefer. Mary Ellen Guffey's Essentials of Business Communication. 8th ed. Mason, OH: Thomson/South-Western, 2010.
एमएलए (9वां संस्करण) प्रशस्ति पत्रGuffey, Mary Ellen, और Carolyn M. Seefer. Mary Ellen Guffey's Essentials of Business Communication. 8th ed. Thomson/South-Western, 2010.
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