1. Chemicals, Global Mercury Assessment, Report No. 54790-01, Geneva, Switzerland;United Nations Environment Programme,2002
2. Mercury Study Report to Congress, EPA-452/R-97-003,1997
3. Directive 2008/105/EC of the European Parliament and of the Council of 16 December 2008 on Environmental Quality Standards in the Field of Water Policy.
4. National Primary Drinking Water Standards, EPA-816/F-09-0004,2009
5. Council Directive 98/83/EC on the Quality of Water Intended for Human Consumption.