Emsley 2003 J. Emsley, Iridium, in Nature's Building Blocks: An A-Z Guide to the Elements, Oxford, England, UK, Oxford University Press, 2003, pp. 201–204, ISBN0-19-850340-7.
(EN) M. W. George, Platinum–Group Metals (PDF), su minerals.usgs.gov, U.S. Geological Survey, Mineral Commodity Summaries, 2007. URL consultato il 16 dicembre 2011.