1. Trust for America's Health, Robert Wood Johnson Foundation. The facts hurt: a state-by-state injury prevention policy report. Washington DC, 2013.
2. Law Center to Prevent Gun Violence. 2013 Scorecard: Why Gun Laws Matter. http://gunlawscorecard.org (accessed 25 Sep 2015).
3. Advances in the epidemiology of injuries as a basis for public policy;Haddon;Public Health Reports,1980
4. US Centers for Disease Control and Prevention. Compressed Mortality File 1999–2013 on CDC WONDER Online Database, released October 2014. http://wonder.cdc.gov/cmf-icd10.html (accessed 2 Apr 2015).
5. United States Census Bureau. http://www.census.gov (accessed 9 Feb 2015).