1. Blair JP, Schweit KW: A study of active shooter incidents in the United States between 2000 and 2013. Texas State University and Federal Bureau of Investigation. 2014. Available at https://www.fbi.gov/file-repository/active-shooter-study-2000-2013-1.pdf/view. Accessed December 19, 2022.
2. Blair JP, Schweit KW: Active shooter incidents in the United States in 2020. Federal Bureau of Investigations. 2021. Available at https://www.fbi.gov/file-repository/active-shooter-incidents-in-theus-2020-070121.pdf/view. Accessed December 19, 2022.
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5. UNODA: How to establish and maintain gun-free zones. 2014. Available at https://www.un.org/disarmament. Accessed December 22, 2022.