1. Oliver, Robert T. 1965.History of Public Speaking in America, 190Boston: Allyn and Bacon, Inc.
2. Wrage, Ernest J. and Baskerville, Barnet, eds. 1960.American Forum: Speeches on Historic Issues, 1788‐1900, 159New York: Harper and Brothers.
3. Evaluating the ethics of a speaker in a democracy
4. An ethical basis of communication