Heller, R. (2003). High impact speeches: How to create and deliver words that move minds. Prentice Hall Business.
Citace podle Chicago (17th ed.)Heller, Richard. High Impact Speeches: How to Create and Deliver Words That Move Minds. London: Prentice Hall Business, 2003.
Citace podle MLA (9th ed.)Heller, Richard. High Impact Speeches: How to Create and Deliver Words That Move Minds. Prentice Hall Business, 2003.
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