1. Chromium;Dubpernell,1974
2. Cadmium;Foulke,1963
3. US Environmental Protection Agency, Toxicological Review of Cadmium, 1989.
4. US Environmental Protection Agency, Toxicological Review of Hexavalent Chromium, 1998.
5. National Defense Center for Environmental Excellence, Regulatory Analysis of the Chromium Electroplating Industry and Technical Alternatives to Hexavalent Chromium Electroplating, 1995.