1. Swedler DI, Simmons MM, Dominici F, Hemenway D. Firearm prevalence and homicides of law enforcement officers in the United States. Am J Public Health. 2015;105:2042–8.
2. Ozonoff D. Lead on the range. Lancet. 1994;343:6–7.
3. Beaucham C, Page E, Alarcon WA, Calver GM, Methner M, Schoonover TM. Indoor firing ranges and elevated BLLs - United States, 2002- 2013. MMWR Morb Mortal Wkly. 2014;63:347–51. https://www.cdc.gov/mmwr/preview/mmwrhtml/mm6316a3.htm Accessed 17 Jan 2017.
4. Small Arms Survey (SAS). Estimating civilian owned firearms. In: Small arms survey research notes, number 9, September 2011. 2011. http://www.smallarmssurvey.org/fileadmin/docs/H-Research_Notes/SAS-Research-Note-9.pdf . Accessed 2 Sept 2016.
5. Small Arms Survey (SAS). 2007. Completing the Count: Civilian Firearms. Graduate Institute Geneva. 2007. http://www.smallarmssurvey.org/publications/by-type/yearbook/small-arms-survey-2007.html . Accessed 2 Sept 2016.