1. 1. H. Renner, in “Ulmanns Encyclopadie der Technischen-Chemie”, 4th ed., 1982, Vertag Chemie, Weinheim.
2. 2. EPA (Enviromental Protection Agency), Ambient Water Quality Criteria for Silver, EPA 4405-80-071, 1980, Office of Water Regulations, Washington, D.C.
3. 3. E. Meian (ed.), “Metals and their Compounds in the Enviroment”, 1991, VCH, New York.
4. 4. A. D. Eaton, L. S. Clesceri, and A. E. Greenberg, “Standard Methods for the Examination of Water and Waste Water”, 19th ed., 1995, American Public Health Association, Washington, D.C.
5. 5. Z. Marczenko, “Separation and Spectrophotometric Determination of Elements”, 1986, Ellishorwood, London.