- EnvironmentalChemistry.com: Barium
 - Offers overview, name in other languages, atomic structure, chemical properties, physical properties, and regulatory information. - WebElements: Barium
- Contains key data, history, uses, compounds, electronic properties, and much more.
- Wikipedia: Barium
- Hyperlinked overview of the element featuring notable characteristics, applications, history, occurrence, compounds, isotopes, and precautions.
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