1. Empathy deficits and trait emotional intelligence in psychopathy and Machiavellianism;Ali;Personality and Individual Differences,2009
2. Buckels, E. (2012). The pleasures of hurting others: Behavioral evidence for everyday sadism. (Unpublished master’s thesis).
3. Studies in Machiavellianism;Christie,1970
4. Cikara, M., Bruneau, E. G., & Saxe, R. R. (2011). Us and them: Intergroup failures of empathy. Current Directions in Psychological Science, 20, 149-153. Retrieved from: .
5. Ekman, P., Friesen, W. V., & Hagar, J. C. (1976/2002). Facial action coding system: The manual on CD-ROM. Salt Lake City, UT: Network Information Research Corporation.