1. Chemistry for Environmental Engineering;Sawyer,1978
2. Priority Toxic Pollutants, Health Impacts and Allowable Limits;Sittig,1980
3. The Biological and Environmental Chemistry of Chromium;Katz,1994
4. International Agency for Research on Cancer IARC, International Agency for Research on Cancer Monographs on the Evaluation of the Carcinogenic Risks to Humans, vol. 49, Chromium, Nickel, and Welding, IARC Publications, 1990.