Thill, John V.
Excellence in business communication/ John V. Thill, Courtland L. Bovee
McGraw-Hill, 1991
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Quible, Zone K.
Business Communication
Prentice Hall International,inc, 1996
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Ewald, Helen Rothschild
Business communication
Prentice-Hall International, 1997
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Krizan, A.C.
Business communication
Thomson, 2008
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Ewald, Helen Rothschild
Business communication
Prentice-Hall International, 1997
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