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