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