Ellen Guffey, M. (2006). Business communicationProcess productMary Ellen Guffey, Kathleen Rhodes dan Patricia Rogin. Salemba Empat.
Lua i Stíl Chicago (17ú heag.)Ellen Guffey, Mary. Business CommunicationProcess ProductMary Ellen Guffey, Kathleen Rhodes Dan Patricia Rogin. Salemba Empat, 2006.
Lua MLA (8ú heag.)Ellen Guffey, Mary. Business CommunicationProcess ProductMary Ellen Guffey, Kathleen Rhodes Dan Patricia Rogin. Salemba Empat, 2006.
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