Ebert, Ronald J.
Business essentials
Pearson, 2015
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Harvard business essentials : business communication
Boston : Harvard Business School Press, 2004,
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Voiles, Price R.
Business English essentials
Glencoe, 1993
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Guffey, Mary Ellen
Essentials of business communication
PWS-Kent, 1988
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Harvard business essentials : negotiation
Harvard Business School Press, 2004
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