Eleventh Report on Carcinogens(PDF). United States Department of Health and Human Services’ National Toxicology Program. [2006-02-02]. (原始内容(PDF)存档于2006-09-29).
Eleventh Report on Carcinogens(PDF). United States Department of Health and Human Services’ National Toxicology Program. [2006-02-02]. (原始内容(PDF)存档于2006-09-29).