1. Ostracism and indirect reciprocity: The reproductive significance of humor;Alexander;Ethology and Sociobiology,1986
2. The concise dictionary of current English;Allen,1990
3. Ball, S., & Johnson, K. (2000). Humour in commercial hospitality settings. In: C. Lashley, A. & Morrison (Eds), In search of hospitality: Theoretical perspectives and debates (pp. 199–216). Oxford: Butterworth Heinemann.
4. Funny business. Humour, management and business culture;Barsoux,1993
5. Not so funny when it happened: The best of travel humor and misadventure,2000