- Visual Elements: Barium - http://www.chemsoc.org/viselements/pages/barium.html
- Image, appearance, source, uses, key isotopes, and ionisation energies.
- It's Elemental: Barium - http://education.jlab.org/itselemental/ele056.html
- Basic physical and historical information.
- ChemicalElements.com: Barium - http://www.chemicalelements.com/elements/ba.html
- Basic information, atomic structure, and isotopes.
- EnvironmentalChemistry.com: Barium - http://environmentalchemistry.com/yogi/periodic/ba.html
- Atomic structure, chemical and physical properties, and table of nuclides.
- Lenntech: Barium - http://www.lenntech.com/periodic-chart-elements/ba-en.htm
- Physical data, chemical properties, health and environmental effects.
- Wikipedia: Barium - http://en.wikipedia.org/wiki/barium
- Properties of the element, including its history, applications, and characteristics.
- LANL: Barium - http://periodic.lanl.gov/elements/56.html
- History, sources, properties, and uses.
- ChemGlobe: Barium - http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/56.html
- Electronic, thermal, and steric data, along with an isotope table.
- WebElements: Barium - http://www.webelements.com/webelements/elements/text/ba/key.html
- Extensive information on history, uses, occurrence, compounds, and properties.
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