ChemGlobe: Cerium
- Electronic, thermal, and steric data along with a table of isotopes.
- http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/58.html

LANL: Cerium
- Sources, properties, and uses.
- http://periodic.lanl.gov/elements/58.html

Wikipedia: Cerium
- Properties of the element, including its history, applications, and characteristics.
- http://en.wikipedia.org/wiki/Cerium

Lenntech: Cerium
- Physical data, chemical properties, health and environmental effects.
- http://www.lenntech.com/Periodic-chart-elements/Ce-en.htm

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

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

It's Elemental: Cerium
- Basic physical and historical information.
- http://education.jlab.org/itselemental/ele058.html

Visual Elements: Cerium
- Image, animation, uses, general and physical information, and key isotopes.
- http://www.chemsoc.org/viselements/pages/cerium.html