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- WebElements: Helium Extensive information on history, uses, occurrence, and properties of the element.
- It's Elemental: Helium Basic physical and historical information.
- ChemicalElements.com: Helium Basic information, atomic structure, and table of isotopes.
- Especiál Gas Inc.: Helium Numeric data, uses, and general information.
- USGS Minerals Information: Helium Statistics and information on the worldwide supply, demand, and flow of the element (PDF format).
- Corrosionsource.com: Helium History, sources, properties, isotopes, and uses.
- EnvironmentalChemistry.com: Helium Atomic structure, chemical and physical properties, and table of nuclides.
- Lenntech: Helium Physical data, chemical properties, and health effects.
- Wikipedia: Helium Properties of the element, including its history, applications, and characteristics.