ChemGlobe: Einsteinium
- Electronic data along with an isotope table and basic facts.
- http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/99.html

LANL: Einsteinium
- Basic information, history, and isotopes.
- http://periodic.lanl.gov/elements/99.html

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

EnvironmentalChemistry.com: Einsteinium
- Atomic structure, chemical and physical properties, and table of nuclides.
- http://environmentalchemistry.com/yogi/periodic/Es.html

It's Elemental: Einsteinium
- Basic physical and historical information.
- http://education.jlab.org/itselemental/ele099.html

ChemicalElements.com: Einsteinium
- Basic information, atomic structure, and table of isotopes.
- http://www.chemicalelements.com/elements/es.html

Visual Elements: Einsteinium
- Discovery, general and physical information, and ionisation energies.
- http://www.chemsoc.org/viselements/pages/einsteinium.html