- ChemGlobe: Iridium
- Electronic, thermal, and steric data along with an isotope table.
- ChemicalElements.com: Iridium
- Basic information, atomic structure, and table of isotopes.
- EnvironmentalChemistry.com: Iridium
- Atomic structure, chemical and physical properties, and table of nuclides.
- It's Elemental: Iridium
- Basic physical and historical information.
- LANL: Iridium
- History, properties, uses, and sources.
- Lenntech: Iridium
- Physical data, chemical properties, health and environmental effects.
- Visual Elements: Iridium
- Image, general and physical information, source, uses, key isotopes, and ionisation energies.
- Wikipedia: Iridium
- Properties of the element, including its history, applications, and characteristics.
- Radiochemistry of Iridium
- Full text of the monograph by G. W. Leddicotte (Oak Ridge National Laboratory, Oak Ridge, Tennessee). [PDF]
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