- ChemGlobe: Americium
- Electronic, thermal, and steric data along with an isotope table.
- ChemicalElements.com: Americium
- Basic information, atomic structure, and isotopes.
- EnvironmentalChemistry.com: Americium
- Atomic structure, properties, and table of nuclides.
- It's Elemental: Americium
- Basic physical and historical information.
- LANL: Americium
- Basic information and history.
- Lenntech: Americium
- Physical data, chemical properties, health and environmental effects.
- Visual Elements: Americium
- Image, general and physical information, and key isotopes.
- WebElements: Americium
- Extensive information on history, uses, compounds, and properties.
- Wikipedia: Americium
- Overview of this synthetic element, its properties, history and applications.
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