Visual Elements: Titanium - Image, general and physical information, source, uses, key isotopes, and ionisation energies.
WebElements: Titanium - Extensive information on history, uses, occurrence, compounds, and properties of the element.
Wikipedia: Titanium - Properties of the element, including its history, applications, and characteristics.
Radiochemistry of Titanium - Full text of the monograph by Vincent J. Landis (San Diego State University, San Diego, California). [PDF] (January, 1971)