- Visual Elements: Erbium - http://www.chemsoc.org/viselements/pages/erbium.html
- Image, physical information, key isotopes, and ionisation energies.
- It's Elemental: Erbium - http://education.jlab.org/itselemental/ele068.html
- Basic physical and historical information.
- ChemicalElements.com: Erbium - http://www.chemicalelements.com/elements/er.html
- Basic information, atomic structure, and isotopes.
- EnvironmentalChemistry.com: Erbium - http://environmentalchemistry.com/yogi/periodic/er.html
- Atomic structure, chemical and physical properties, and table of nuclides.
- Lenntech: Erbium - http://www.lenntech.com/periodic-chart-elements/er-en.htm
- Physical data, chemical properties, health and environmental effects.
- Wikipedia: Erbium - http://en.wikipedia.org/wiki/erbium
- Properties of the element, including its history, applications, and characteristics.
- LANL: Erbium - http://periodic.lanl.gov/elements/68.html
- Basic information and history.
- ChemGlobe: Erbium - http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/68.html
- Electronic, thermal, and steric data along with an isotope table.
- WebElements: Erbium - http://www.webelements.com/webelements/elements/text/er/key.html
- Extensive information on history, uses, occurrence, compounds, and properties.
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