1. Bureau of Mines, 1994, Chromium in May 1994, Mineral Industry Surveys, U.S. Department of the Interior, Washington, DC
2. W. H. Hartford, 1986, The fundamental chemistry of industrial chromium compounds and some thoughts on their biological activity, Chromium Symposium 1986: An Update, Industrial Health Foundation, Inc. Pittsburgh
3. R. D. Nelson, 1980, Chromium chemistry, Chromium Symposium 80—Focus of a Standard, Industrial Health Foundation, Inc. Pittsburgh
4. Chromium in the Natural and Human Environments;Nriagu,1988
5. Atlas of Electrochemical Equilibria in Aqueous Solutions;Pourbaix,1974