Lua APA (7ú heag.)

Ober, S. (2003). Contemporary business communication (5th ed.). Houghton Mifflin Co..

Lua i Stíl Chicago (17ú heag.)

Ober, Scot. Contemporary Business Communication. 5th ed. Boston: Houghton Mifflin Co., 2003.

Lua MLA (8ú heag.)

Ober, Scot. Contemporary Business Communication. 5th ed. Houghton Mifflin Co., 2003.

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