1. 3M (Minnesota Mining and Manufacturing) (2009) 2009 Respirator selection guide. 3M, Occupational Health and Environmental Safety Division, St Paul
2. ACGIH (American Conference of Governmental Industrial Hygienists) (2001) Ozone. In Documentation of the TLVs7 and BEIs7. American Conference of Governmental Industrial Hygienists, Cincinnati, [CD-ROM]
3. ACGIH (American Conference of Governmental Industrial Hygienists) (2018) TLVs and BEIs for chemical substances and physical agents & biological exposure indices. American Conference of Governmental Industrial Hygienists, Cincinnati
4. Althouse AD, Turnquist CH, Bowditch WA, Bowditch KE (1988) Modern welding. Goodheart-Willock Company, Inc., South Holland
5. Bollinger N (2004) NIOSH respirator selection logic (DHHS (NIOSH) Publication No. 2005-100). Department of Health and Human Services (US), Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, Cincinnati