1. APA. 2016. About APA: Our Work. American Psychological Association. http://www.apa.org/about/index.aspx . Accessed 22 Aug 2016.
2. Arendt, H. 1951. The Origins of Totalitarianism. New York: Schocken Books.
3. Balz, D. 2016. Killings and Racial Tensions Commingle with Divided and Divisive Politics. The Washington Post. https://www.washingtonpost.com/politics/killings-and-racial-tensions-commingle-with-divided-and-divisive-politics/2016/07/08/5a422e08-451e-11e6-88d0-6adee48be8bc_story.html . Accessed 25 Aug 2016.
4. Barry, D., S.F. Kovaleski, A. Blinder, and M. Mashal. 2016. “Always Agitated. Always Mad”: Omar Mateen, According to Those Who Knew Him. http://www.nytimes.com/2016/06/19/us/omar-mateen-gunman-orlando-shooting.html . Accessed 27 Aug 2016.
5. Baumeister, R.F., and D.M. Tice. 1990. Anxiety and Social Exclusion. Journal of Social and Clinical Psychology 9: 165–195.