Visual Elements: Tungsten - Image, general and physical information, source, uses, key isotopes, and ionisation energies.
WebElements: Tungsten - Extensive information on history, uses, occurrence, compounds, and properties.
Wikipedia: Tungsten - Properties of the element, including its history, applications, and characteristics.
Radiochemistry of Tungsten - Full text of the monograph by G. W. Leddicotte (Oak Ridge National Laboratory, Oak Ridge, Tennessee). [PDF] (September, 1961)