1. Directive 83/477/EC, Protection of workers from danger connecting with the exposure to carcinogenic substances at work, 1983 (modification of 1997/42/EU, 1999/38/EU and 2003/18/EU).
2. Occupational Safety and Health Administration (OSHA), Occupational Safety and Health Standards, Toxic and Hazardous Substances, Code of Federal Regulations, 29 CFR 1910.1001, 1998.
3. U.S. Environmental Protection Agency, Code of Federal Regulations 40 CFR 763, July 1, 1987, Code of Federal Regulations 40 CFR 763 Addendum, October 30, 1987.
4. Pocket Guide to Chemical Hazards;National Institute for Occupational Safety and Health (NIOSH),1997
5. TLVs and BEIs, Threshold Limit Values for Chemical Substances and Physical Agents;American Conference of Governmental Industrial Hygienists (ACGIH),1999