References
- Cullen, D. (2009). Columbine. New York, NY: Twelve.
- Daly, S. E. (2018). Assessing and averting the prevalence of mass violence. Hershey, Pennsylvani: IGI Global.
- Lysiak, M. (2013). Newtown: An American tragedy. New York, NY: Gallery Books.
- Schildkraut, J. (2018). Mass shootings in America: Understanding the debates, causes, and responses. Santa Barbara, CA: ABC-CLIO.