LUCAS, S. E. (2020). The art of public speaking 13th ed. MC GRAW HILL.
Lua i Stíl Chicago (17ú heag.)LUCAS, Stephen E. The Art of Public Speaking 13th Ed. MC GRAW HILL, 2020.
Lua MLA (8ú heag.)LUCAS, Stephen E. The Art of Public Speaking 13th Ed. MC GRAW HILL, 2020.
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