Guffey, Mary Ellen
Essentials of business communication
PWS-Kent, 1988
 Buku Teks
Guffey, Mary Ellen
Essentials of business communication
PWS Publishing, 1991
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Harvard business essentials : business communication
Boston : Harvard Business School Press, 2004,
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Guffey, Mary Ellen
Essentials of business communication / Mary Ellen Guffey, Bertha Du-Babcock
Cengage Learning Asia, 2008
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Ebert, Ronald J.
Business essentials
Prentice-Hall, 2003
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