The most useful book on public speaking is the Sir Winston Method by James C Humes. It’s out of print, but easy to find used.
The author, a former speechwriter, does a fantastic job of analyzing how to speak in public and gives you a step-by-step method on preparing your speech and how to present it so that you seem confident, easily understood, and poised. It completely changed the way I did speaking for the better.
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Contributors: Janet Perry from needlepoint.guru