1. FBI Office of Partner Engagement, FBI Criminal Investigative Division, FBI Critical Incident Response Group, Advanced Law Enforcement Rapid Response Training (ALERRT) Center at Texas State University (US). Active shooter incidents in the United States in 2021. Washington D.C.: U.S. Department of Justice . 2022. p 30. Available from: https://www.fbi.gov/file-repository/active-shooter-incidents-in-the-us-2021-052422.pdf/view
2. Ledur J, Rabinowitz K. There have been more than 600 mass shootings so far in 2022. The Washington Post. 2 June 2022. https://www.washingtonpost.com/nation/2022/06/02/mass-shootings-in-2022/. Accessed 5 Dec 2022
3. Gun Violence Archive. Past Summary Ledgers Gun Violence Archive. 29 April 2023. https://www.gunviolencearchive.org/past-tolls. Accessed 29 April 2023
4. National Center for Education Statistics. Violent deaths at school and away from school and school shootings condition of education: U.S. Department of Education, Institute of Education Sciences; 2022. https://nces.ed.gov/programs/coe/indicator/a01/violent-deaths-and-shootings?tid=4. Accessed 5 Dec 2022
5. National Threat Assessment Center (US). Enhancing school safety using a threat assessment model: an operational guide for preventing targeted school violence [Internet]. U.S. Secret Service Department of Homeland Security. 2018. p. 32. Available from: https://www.cisa.gov/sites/default/files/publications/18_0711_USSS_NTAC-Enhancing-School-Safety-Guide.pdf