1. Aiken, L. S., and West, S. G. (1991). Multiple regression: Testing and interpreting interactions. Newbury Park, CA: Sage.
2. Angyal, A. (1941). Disgust and related aversions. Journal of Abnormal and Social Psychology, 36, 393–412.
3. Costa, P., and McCrae, R. (1992). The NEO Personality Inventory-Revised. Odessa, FL: Psychological Assessment Resources.
4. Darwin, C. R. (1872). The expression of emotions in man and animals. London: John Murray. Reprinted Chicago: University of Chicago Press, 1965.
5. Digman, J. M. (1990). Personality structure: Emergence of the five-factor model. Annual Review of Psychology, 41, 417–440.