ChemGlobe: Ytterbium
- Electronic, thermal, and steric data along with an isotope table.
- http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/70.html

LANL: Ytterbium
- History, sources, properties, and uses.
- http://periodic.lanl.gov/elements/70.html

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

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

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

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

It's Elemental: Ytterbium
- Basic physical and historical information.
- http://education.jlab.org/itselemental/ele070.html

Visual Elements: Ytterbium
- Image, physical information, and ionisation energies.
- http://www.chemsoc.org/viselements/pages/ytterbium.html