US EPA 2003: Health Effects Support Document for Hexachlorobutadiene, EPA 822-R-03-002, United States Environment Protection Agency. (http://www.epa.gov/ogwdw/ccl/pdfs/reg_determine1/support_cc1_hexachlorobutadiene_healtheffects.pdf, 2012-01-21)
US EPA 2003: Health Effects Support Document for Hexachlorobutadiene, EPA 822-R-03-002, United States Environment Protection Agency. (http://www.epa.gov/ogwdw/ccl/pdfs/reg_determine1/support_cc1_hexachlorobutadiene_healtheffects.pdf, 2012-01-21)