1. Cullen, D.: Columbine. Twelve Hachette Book Group, New York (2010)
2. State of Colorado. Columbine Official Report: Columbine Review Commission: 2001 (2001)
3. Chastain, M.A.: Shoot first: Columbine tragedy transformed police tactics. USA Today, 19 April 2009
4. Roy, L.: No Right to Remain Silent: What We’ve Learned from the Tragedy at Virginia Tech. Three Rivers Press, New York (2009)
5. Lysiak, M.: Newtown - An American Tragedy. Gallery Books, New York (2013)