ChemGlobe: Rutherfordium: Electronic and thermal data along with an isotope table.
ChemicalElements.com: Rutherfordium: Basic information, atomic structure, and isotopes.
EnvironmentalChemistry.com: Rutherfordium: Atomic structure and table of nuclides.
It's Elemental: Rutherfordium: Basic physical and historical information.
LANL: Rutherfordium: Basic information, history, and isotopes.
Lenntech: Rutherfordium: Physical data and chemical properties.
Rutherfordium: Historic information.
Visual Elements: Rutherfordium: Physical information, key isotopes, and ionisation energies.
WebElements: Rutherfordium: Information on history and properties.