- http://www.lenntech.es/periodica/elementos/pb.htm
- http://es.wikipedia.org/wiki/Plomo
- http://www.lenntech.es/periodica/elementos/hg.htm
- http://www.radiochemistry.org/periodictable/elements/80.html
- http://www.ccbasilea-crestocolmo.org.uy/wp-content/uploads/2010/11/Qu%C3%A9-es-el-mercurio.pdf
- http://www.pdv.com/lexico/museo/minerales/mercurio.htm
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