CHAMBERS HARRY E. (2001). EFFECTIVE COMMUNICATION SKILLS. PERSEUS PUBLICATIONS.
Lua i Stíl Chicago (17ú heag.)CHAMBERS HARRY E. EFFECTIVE COMMUNICATION SKILLS. CAMBRIDGE: PERSEUS PUBLICATIONS, 2001.
Lua MLA (9ú heag.)CHAMBERS HARRY E. EFFECTIVE COMMUNICATION SKILLS. PERSEUS PUBLICATIONS, 2001.
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