Kardous, Chucri A.; Murphy, William J. (2010). "Noise control solutions for indoor firing ranges". Noise Control Engineering Journal. 58 (4): 345. doi:10.3397/1.3455050. ISSN0736-2501.
Kardous, Chucri A.; Murphy, William J. (2010). "Noise control solutions for indoor firing ranges". Noise Control Engineering Journal. 58 (4): 345. doi:10.3397/1.3455050. ISSN0736-2501.