Weeks, Mary Elvira (1932). "The discovery of the elements: III. Some eighteenth-century metals". Journal of Chemical Education. 9 (1): 22. Bibcode:1932JChEd...9...22W. doi:10.1021/ed009p22.
Regulation (EC) No 1272/2008 of the European Parliament and of the Council of 16 December 2008 on Classification, Labelling and Packaging of Substances and Mixtures, Amending and Repealing Directives 67/548/EEC and 1999/45/EC and amending Regulation (EC) No 1907/2006 [OJ L 353, 31.12.2008, p. 1]. Annex VIАрхивировано 14 марта 2019 года.. Accessed July 13, 2017.
Weeks, Mary Elvira (1932). "The discovery of the elements: III. Some eighteenth-century metals". Journal of Chemical Education. 9 (1): 22. Bibcode:1932JChEd...9...22W. doi:10.1021/ed009p22.
National Toxicology Program. (2016). «Report on Carcinogens»Архивировано 20 сентября 2017 года., 14th ed. Research Triangle Park, NC: U.S. Department of Health and Human Services, Public Health Service.
Regulation (EC) No 1272/2008 of the European Parliament and of the Council of 16 December 2008 on Classification, Labelling and Packaging of Substances and Mixtures, Amending and Repealing Directives 67/548/EEC and 1999/45/EC and amending Regulation (EC) No 1907/2006 [OJ L 353, 31.12.2008, p. 1]. Annex VIАрхивировано 14 марта 2019 года.. Accessed July 13, 2017.
National Toxicology Program. (2016). «Report on Carcinogens»Архивировано 20 сентября 2017 года., 14th ed. Research Triangle Park, NC: U.S. Department of Health and Human Services, Public Health Service.