1. Centers for Disease Control and Prevention. Web-based Inquiry Statistics Query and Reporting System (WISQARS). Atlanta, GA: National Center for Injury Prevention and Control; 2018.
https://webappa.cdc.gov/sasweb/ncipc/mortrate.html
. Accessed 14 Dec 2018.
2. Siegel M, Pahn M, Xuan Z, et al. Firearm-related laws in all 50 US states, 1991–2016. Am J Public Health. 2017;107(7):1122–9.
3. Crifasi CK, Merrill-Francis M, McCourt A, et al. Association between firearm laws and homicide in urban counties. J Urban Health. 2018;95(3):383–90.
4. Everytown for Gun Safety. Gun law navigator. New York: Everytown for Gun Safety; 2018.
https://everytownresearch.org/navigator/index.html
. Accessed 14 Dec 2018.
5. Wooldridge JM. Introductory Econometrics: a Modern Approach (5th edition). Mason, OH: South-Western Cengage Learning; 2013.