ChemGlobe: Rutherfordium
- Electronic and thermal data along with an isotope table.
- http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/104.html

LANL: Rutherfordium
- Basic information, history, and isotopes.
- http://periodic.lanl.gov/elements/104.html

Lenntech: Rutherfordium
- Physical data and chemical properties.
- http://www.lenntech.com/Periodic-chart-elements/Rf-en.htm

EnvironmentalChemistry.com: Rutherfordium
- Atomic structure and table of nuclides.
- http://environmentalchemistry.com/yogi/periodic/Rf.html

ChemicalElements.com: Rutherfordium
- Basic information, atomic structure, and isotopes.
- http://www.chemicalelements.com/elements/rf.html

It's Elemental: Rutherfordium
- Basic physical and historical information.
- http://education.jlab.org/itselemental/ele104.html

Visual Elements: Rutherfordium
- Physical information, key isotopes, and ionisation energies.
- http://www.chemsoc.org/viselements/pages/rutherfordium.html