1. http://www.atsdr.cdc.gov/toxprofiles/phs46.html accessed on 01/10/2010.
2. http://www.environmentwriter.org/resources/backissues/chemicals/mercury.htm accessed on 01/10/2010.
3. http://www.epa.gov accessed on 01/10/2010.
4. http://www.epa.gov/NCEA/iris/subst/0676.htm accessed on 05/10/2010.
5. http://www.atsdr.cdc.gov/toxprofiles/phs23.html accessed on 05/10/2010.