Guffey, M. E., & Loewy, D. (2010). Essentials of business communication (8th ed.). South-Western/Cengage Learning.
Citace podle Chicago (17th ed.)Guffey, Mary Ellen, a Dana Loewy. Essentials of Business Communication. 8th ed. Mason, Ohio: South-Western/Cengage Learning, 2010.
Citace podle MLA (9th ed.)Guffey, Mary Ellen, a Dana Loewy. Essentials of Business Communication. 8th ed. South-Western/Cengage Learning, 2010.
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