1. Freud, S. (1963). Jokes and their relation to the unconscious. New York, NY: W.W. Norton.
2. Fry, W., Jr. (1963). Sweet madness: A study of humor. Palo Alto, CA: Pacific Books.
3. Koestler, A. (1949). Insight and outlook. New York, NY: Macmillan.
4. McKeon, R. (Ed.). (1941). The basic works of Aristotle. New York, NY: Random House.
5. Laughter.;Provine;The American Behavioral Scientist,1996