Ellen Guffey, M. (2005). Business communicationProcess & productMary Ellen Guffey, Kathleen Rhodes and Patricia Rogin; Penerjemah: Ichsan Setyo Budi. Salemba Empat.
Lua i Stíl Chicago (17ú heag.)Ellen Guffey, Mary. Business CommunicationProcess & ProductMary Ellen Guffey, Kathleen Rhodes and Patricia Rogin; Penerjemah: Ichsan Setyo Budi. Salemba Empat, 2005.
Lua MLA (8ú heag.)Ellen Guffey, Mary. Business CommunicationProcess & ProductMary Ellen Guffey, Kathleen Rhodes and Patricia Rogin; Penerjemah: Ichsan Setyo Budi. Salemba Empat, 2005.
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