1. Andress, W. C., Hoshino, M., & Rorke, S. C. (2010, July). Empirical evidence for therapeutic laughter courses on a university campus. Paper presented at the 35th Annual National Wellness Conference, Stevens Point, WI.
2. Beermann, U., & Ruch, W. (2009a). How virtuous is humor? What we can learn from current instruments. The Journal of Positive Psychology, 4, 528–539.
3. Beermann, U., & Ruch, W. (2009b). How virtuous is humor? Evidence from everyday behavior. Humor: International Journal of Humor Research, 22, 395–417.
4. Beh-Pajooh, A., Jahangiri, M., & Zahrakar, K. (2010). Humor skills training and reducing depression in patients with spinal chord injury. Journal of Iranian Psychologists, 6, 227–236.
5. Craik, K. H., Lampert, M. D., & Nelson, A. J. (1996). Sense of humor and styles of everyday humorous conduct. Humor: International Journal of Humor Research, 9, 273–302.