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ChemGlobe: Lutetium - Electronic, thermal, and steric data along with an isotope table.
ChemicalElements.com: Lutetium - Basic information, atomic structure, and table of isotopes.
EnvironmentalChemistry.com: Lutetium - Atomic structure, chemical and physical properties, and table of nuclides.
It's Elemental: Lutetium - Basic physical and historical information.
LANL: Lutetium - Basic information and history.
Lenntech: Lutetium - Physical data, chemical properties, health and environmental effects.
Visual Elements: Lutetium - Image, physical information, and key isotopes.
Wikipedia: Lutetium - Properties of the element, including its history, applications, and characteristics.