1. U.S. Department of Labor, Bureau of Labor Statistics, Census of Fatal Occupational Injuries: 2003 Data. Available at: http://www.bls.gov.
2. U.S. Department of Labor, Bureau of Labor Statistics, Census of Non-Fatal Occupational Injuries: 2003 Data. Available at: http://www.bls.gov.
3. World Health Organization (WHO). Available at: http://www.who.int.
4. World Health Organization Global strategy on Occupational Health. Available at: http://www.who.int.
5. U.S. EPA Inventory Update Rule. Available at: http://www.epa.gov.