1. Agency for Toxic Substances and Disease Registry (ATSDR). (2004). Toxicological profile for copper. Atlanta, GA: U.S. Department of Health and Human Services, Public Health Service.
2. Agency for Toxic Substances and Disease Registry (ATSDR). (2005a). Toxicological profile for nickel. Atlanta, GA: U.S. Department of Health and Human Services, Public Health Service.
3. Agency for Toxic Substances and Disease Registry (ATSDR). (2005b). Toxicological profile for zinc. Atlanta, GA: U.S. Department of Health and Human Services, Public Health Service.
4. Agency for Toxic Substances and Disease Registry (ATSDR). (2007). Toxicological profile for lead. Atlanta, GA: U.S. Department of Health and Human Services, Public Health Service.
5. Agency for Toxic Substances and Disease Registry (ATSDR). (2012a). Toxicological profile for chromium. Atlanta, GA: U.S. Department of Health and Human Services, Public Health Service.