Guffey, M. E. (1991). Essentials of business communication. Mason, OH.
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Citação norma Chicago
Guffey, Mary E. Essentials of Business Communication. London: Mason, OH, 1991.
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Citação norma MLA
Guffey, Mary E. Essentials of Business Communication. Mason, OH, 1991.
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Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.