Ellen Guffey, M. (2006). Business communicationProcess productMary Ellen Guffey, Kathleen Rhodes dan Patricia Rogin. Salemba Empat.
Cita Chicago Style (17a ed.)Ellen Guffey, Mary. Business CommunicationProcess ProductMary Ellen Guffey, Kathleen Rhodes Dan Patricia Rogin. Salemba Empat, 2006.
Cita MLA (8a ed.)Ellen Guffey, Mary. Business CommunicationProcess ProductMary Ellen Guffey, Kathleen Rhodes Dan Patricia Rogin. Salemba Empat, 2006.
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