1. Branch, A. Y., Fine, G. A., & Jones, J. M. (1973).Laughter, smiling, and rating scale: An analysis of response to tape recorded humor. Paper presented at the meeting of the American Psychological Association, Washington, DC.
2. Chapman, T. (1976). Social aspects of humorous laughter. In T. Chapman & H. C. Foot (Eds.),Humor and laughter: Theory, research and applications. London: Wiley.
3. Craig, K. D., & Patrick, C. J. (1985). Facial expression during induced pain.Journal of Personality and Social Psychology, 48 1080?1091.
4. D'Amato, M. R. (1970).Experimental psychology. New York: McGraw-Hill.
5. Deckers, L., Edington, J., & VanCleave, G. (1981). Mirth as a function of incongruities in judged and unjudged dimensions of psychophysical tasks.Journal of Genderal Psychology, 105 225?233.