- Chemical Elements.com: Californium
 - Overview with basic information, atomic structure, isotopes, and more. - EnvironmentalChemistry.com: Californium
- Features overview, name in other languages, atomic structure, chemical properties, physical properties, and regulatory information.
- WebElements: Californium
- Covers essential data, description, history, uses, compounds, electronic properties, and more.
- Wikipedia: Californium
- Hyperlinked article on the element with notable characteristics, history, isotopes and more.
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