- Visual Elements: Erbium - Image, physical information, key isotopes, and ionisation energies.
- Erbium - Includes the history of the element, and a data sheet.
- It's Elemental: Erbium - Basic physical and historical information.
- ChemicalElements.com: Erbium - Basic information, atomic structure, and isotopes.
- EnvironmentalChemistry.com: Erbium - Atomic structure, chemical and physical properties, and table of nuclides.
- WebElements: Erbium - Extensive information on history, uses, occurrence, compounds, and properties.
- Lenntech: Erbium - Physical data, chemical properties, health and environmental effects.
- Wikipedia: Erbium - Properties of the element, including its history, applications, and characteristics.
- LANL: Erbium - Basic information and history.
- ChemGlobe: Erbium - Electronic, thermal, and steric data along with an isotope table.
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