ChemGlobe: Berkelium
- Electronic and thermal data along with an isotope table.
- http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/97.html

LANL: Berkelium
- Basic information and history.
- http://periodic.lanl.gov/elements/97.html

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

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

Visual Elements: Berkelium
- General and physical information, and key isotopes.
- http://www.chemsoc.org/viselements/pages/berkelium.html

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

It's Elemental: Berkelium
- Basic physical and historical information.
- http://education.jlab.org/itselemental/ele097.html

The Columbia Encyclopedia: Berkelium
- Overview for the general reader.
- http://www.bartleby.com/65/be/berkeliu.html

Britannica Nobel Prizes: Berkelium
- Overview and basic data.
- http://www.britannica.com/nobel/micro/64_86.html