We mentioned that you can find many comprehensive books on public speaking. Some more recent titles include:
How to Write and Give a Speech: A Practical Guide for Anyone Who Has to Make Every Word Count, by Joan Detz. St. Martin’s Press, 2014.
Public Speaking: An Audience-Centered Approach, by Steven A. Beebe and Susan J. Beebe. Pearson Education, 2000.
Public Speaking, 5th ed., by Michael Osborn and Suzanne Osborn. Houghton Mifflin, 2000.
The Art of Public Speaking by Stephen Lucas. McGraw-Hill, 2011.
Principles of Public Speaking, by Kathleen M. German, Bruce E. Gronbeck, Douglas Ehninger, and Alan H. Monroe. Longman, 2000.
Older but insightfully written books include:
Speech: A First Course, by E.C. Buehler ...