Lua APA (7ú heag.)

Lesikar, R. (1979). Basic business communication. Richard D Irwin.

Lua i Stíl Chicago (17ú heag.)

Lesikar, Raymond. Basic Business Communication. NULL: Richard D Irwin, 1979.

Lua MLA (9ú heag.)

Lesikar, Raymond. Basic Business Communication. Richard D Irwin, 1979.

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