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