Dale Carnegie. (2011). How to develop self confidence and influence people by public speaking. Harmony books.
Chicago-tyylinen lähdeviittausDale Carnegie. How to Develop Self Confidence and Influence People by Public Speaking. Kozhikode: Harmony books, 2011.
MLA-viiteDale Carnegie. How to Develop Self Confidence and Influence People by Public Speaking. Harmony books, 2011.
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