Visual Elements: Molybdenum - Image, general and physical information, source, uses, key isotopes, and ionisation energies.
WebElements: Molybdenum - Extensive information on history, uses, occurrence, compounds, and properties.
Wikipedia: Molybdenum - Properties of the element, including its history, applications, and characteristics.
Radiochemistry of Molybdenum - Full text of the monograph by E. M. Scadden (U.S. Naval Radiological Defense Laboratory, San Francisco, California). [PDF] (January, 1960)