9Aarnio, K., & Lindeman, M. (2005) Paranormal beliefs, education, and thinking styles. Personality and Individual Differences, 39, 1227-1236.
10Bleak, J. L., & Frederick, C. M. (1998) Superstitious behavior in sport: levels of effectiveness and determinants of use in three collegiate sports. Journal of Sport Behavior, 21(1), 1-15.