- ChemGlobe: Europium - Electronic, thermal, and steric data along with isotopes table.
www.vcs.ethz.ch/chemglobe/ptoe/_/63.html
- ChemicalElements.com: Europium - Basic information, atomic structure, and isotopes.
www.chemicalelements.com/elements/eu.html
- Europium - Data tables and historic information.
www.scescape.net/~woods/elements/europium.html
- It's Elemental: Europium - Basic physical and historical information.
education.jlab.org/itselemental/ele063.html
- LANL: Europium - History, production, properties, sources, and uses.
pearl1.lanl.gov/periodic/elements/63.html
- Visual Elements: Europium - Image, source, physical information, and key isotopes.
www.chemsoc.org/viselements/pages/europium.html
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