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McAuley, Jack G., Speech: The Essential Elements, Minneapolis, MN: Burgess Publishing Company, 1968.
McCrimmon, James M., Writing with a Purpose, 4th ed., Boston: Houghton Mifflin Company, 1967.
Mehrabian, Albert, Nonverbal Communication, Chicago: Aldine-Atherton, Inc., 1972.
Sandford, William Phillips, and Willard Hayes Yeager, Principles of Effective Speaking, 6th ed., New York: The Ronald Press Company, 1963.
Stewart, John (ed.), Bridges Not Walls, 2nd ed., Reading, MA: Addison Wesley Publishing Company, 1977.