Ober, S. (1998). Contemporary business communication (3rd ed.). Houghton Mifflin Co.
Lua i Stíl Chicago (17ú heag.)Ober, Scot. Contemporary Business Communication. 3rd ed. Boston: Houghton Mifflin Co, 1998.
Lua MLA (9ú heag.)Ober, Scot. Contemporary Business Communication. 3rd ed. Houghton Mifflin Co, 1998.
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