1. Occupational Safety and Health Administration, “Occupational Noise Exposure,” (Online). Available: https://www.osha.gov/SLTC/noisehearingconservation/ . Accessed 1 July 2015
2. Masterson, E.A., Deddens, J.A., Themann, C.L., Bertke, S., Calvert, G.M.: Trends in worker hearing loss by industry sector, 1981–2010. Am. J. Ind. Med. 58, 392–401 (2015)
3. Tak, S., Davis, R.R., Calvert, G.M.: Exposure to hazardous workplace noise and use of hearing protection devices among US Workers—NHANES, 1999–2004. Am. J. Ind. Med. 52(5), 358–371 (2009)
4. Roo, F.d., Gerretsen, E., Borst, J.: Environmental impact of noise from mobile outdoor equipment, In: 7th European Conference on Noise Control, EURONOISE 2008 and Acoustics ’08, Paris (2008)
5. National Institute for Occupational Safety and Health: Criteria for a Recommended Standard. U.S. Department of Health and Human Services, Cincinnati (1998)