- Visual Elements: Calcium - http://www.chemsoc.org/viselements/pages/calcium.html
- Image, animation, source, uses, and physical information.
- It's Elemental: Calcium - http://education.jlab.org/itselemental/ele020.html
- Basic physical and historical information.
- ChemicalElements.com: Calcium - http://www.chemicalelements.com/elements/ca.html
- Basic information, atomic structure, and isotopes.
- EnvironmentalChemistry.com: Calcium - http://environmentalchemistry.com/yogi/periodic/ca.html
- Atomic structure, chemical and physical properties, and table of nuclides.
- Lenntech: Calcium - http://www.lenntech.com/periodic-chart-elements/ca-en.htm
- Physical data, chemical properties, and health effects.
- Wikipedia: Calcium - http://en.wikipedia.org/wiki/calcium
- Properties of the element, including its history, applications, and characteristics.
- LANL: Calcium - http://periodic.lanl.gov/elements/20.html
- History, sources, properties, uses, and compounds.
- ChemGlobe: Calcium - http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/20.html
- Electronic, thermal, and steric data along with an isotope table.
- WebElements: Calcium - http://www.webelements.com/webelements/elements/text/ca/key.html
- Extensive information on history, uses, occurrence, compounds, and properties of the element.
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