Kardous, C. A.; Willson, R. D.; Hayden, C. S.; Szlapa, P.; Murphy, W. J.; Reeves, E. R. (2003). "Noise exposure assessment and abatement strategies at an indoor firing range". Applied Occupational and Environmental Hygiene. 18 (8): 629–36. doi:10.1080/10473220301409. PMID12851012.
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Marlin, Marlin, Jeffrey A. "The National Guard, the National Board for the Promotion of Rifle Practice, and the National Rifle Association: Public Institutions and the Rise of a Lobby for Private Gun Ownership." (Dissertation, Georgia State University, 2013). online
Kardous, C. A.; Willson, R. D.; Hayden, C. S.; Szlapa, P.; Murphy, W. J.; Reeves, E. R. (2003). "Noise exposure assessment and abatement strategies at an indoor firing range". Applied Occupational and Environmental Hygiene. 18 (8): 629–36. doi:10.1080/10473220301409. PMID12851012.
