Tuhovsky,IAN. (2020). Effective Communication Skills Mastery Bible: 4 Books in 1 (NA.). Amazon.
Lua i Stíl Chicago (17ú heag.)Tuhovsky,IAN. Effective Communication Skills Mastery Bible: 4 Books in 1. NA. Amazon, 2020.
Lua MLA (9ú heag.)Tuhovsky,IAN. Effective Communication Skills Mastery Bible: 4 Books in 1. NA. Amazon, 2020.
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