1. Respirator Protection Handbook;Revoir,1997
2. National Institute of Occupational Safety and Health (NIOSH) Guide to Industrial Respiratory Protection. DHHS (NIOSH) Publication No. 87–116. Cincinnati, OH: NIOSH, 1987.
3. Respiratory Protection;Code of Federal Regulations,1998
4. Practical Guide to Respirator Usage in Industry;Rajhans,1985