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