- It's Elemental: Hafnium - http://education.jlab.org/itselemental/ele072.html
- Basic physical and historical information.
- ChemicalElements.com: Hafnium - http://www.chemicalelements.com/elements/hf.html
- Basic information, atomic structure, and isotopes.
- Visual Elements: Hafnium - http://www.chemsoc.org/viselements/pages/hafnium.html
- General and physical information, source, uses, key isotopes, and ionisation energies.
- EnvironmentalChemistry.com: Hafnium - http://environmentalchemistry.com/yogi/periodic/hf.html
- Atomic structure, chemical and physical properties, and table of nuclides.
- Lenntech: Hafnium - http://www.lenntech.com/periodic-chart-elements/hf-en.htm
- Physical data, chemical properties, health and environmental effects.
- Wikipedia: Hafnium - http://en.wikipedia.org/wiki/hafnium
- Properties of the element, including its history, applications, and characteristics.
- LANL: Hafnium - http://periodic.lanl.gov/elements/72.html
- History, properties, uses, and handling.
- ChemGlobe: Hafnium - http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/72.html
- Electronic, thermal, and steric data along with an isotope table.
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