Ellen Guffey, M. (2006). Business communicationProcess productMary Ellen Guffey, Kathleen Rhodes dan Patricia Rogin. Salemba Empat.
Chicago Style aipamenaEllen Guffey, Mary. Business CommunicationProcess ProductMary Ellen Guffey, Kathleen Rhodes Dan Patricia Rogin. Salemba Empat, 2006.
MLA aipamenaEllen Guffey, Mary. Business CommunicationProcess ProductMary Ellen Guffey, Kathleen Rhodes Dan Patricia Rogin. Salemba Empat, 2006.
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