1. Active Shooter How to Respond. (2008, October). U.S. Department of Homeland Security. Retrieved on January 22, 2018 from https://www.dhs.gov/xlibrary/assets/active_shooter_booklet.pdf
2. Cops and Cameras
3. School Violence: The School Environment and its Impact on Learning.;B. E.Anderson;An Interdisciplinary Journal,2016
4. BrownB.MerrittR. (2002). No easy answers; the truth behind death at Columbine. New York, NY: Lantern Books.
5. Buncombe, A. (2018, February 15). Nikolas Cruz placed on suicide watch after first court appearance for Florida shooting. The Independent. Retrieved on February 28, 2018 from http://www.independent.co.uk/news/world/americas/florida-shooting-latest-alleged gunman-nikolas-cruz-suicide-watch-broward-county-court-fort-a8213181.html