1. Andrus Foundation. 1983. Humor: the tonic you can afford. Los Angeles: University of Southern California.
2. Autonomic response patterns during sadness and mirth;Averill;Psychophysiology,1969
3. Laughing as a releaser of petit epilepsy fits;Beneicke;Psychiatry, Neurology, Medical Psychology,1967
4. Laughter: an essay on the meaning of the comic;Bergson,1921
5. Conflict, arousal and curiosity;Berlyne,1960