1. P. Simeonova, L. Fishbein, United Nations Environment Programme, International Labour Organization, World Health Organization in Inter-Organization Programme for the Sound Management of Chemicals, Geneva, 2004, pp. 1, 10–11.
2. Code of Federal Regulations, Section 162, Title 40, Federal Register, 2002, pp. 428–429.
3. U.S. EPA National Exposure Research Laboratory (NERL), Microbiological and Chemical Exposure Assessment Research Division (MCEARD), Method 335.4, Methods for the Determination of Inorganic Substances in Environmental Samples, Cyanide, total in water (semi-automated colorimetry) (EPA/600/R-93/100), Ohio, 1993.
4. W. Diamond, EPA Public Water System (PWS) Warning, WSG 79, Washington, DC, 1994.