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  1. The Manhattan Project. An Interactive History. US Department of Energy
  2. Theodore Gray (2009). The Elements: A Visual Exploration of Every Known Atom in the Universe. New York: Black Dog & Leventhal Publishers. p. 240. ISBN 978-1-57912-814-2. 
  3. Actinide element, Encyclopædia Britannica on-line
  4. Althou "actinoid" (rather than "actinide") means "actinium-lik" an tharefore should exclude actinium, that element is uisually includit in the series.
  5. Neil G. Connelly; et al. (2005). "Elements". Nomenclature of Inorganic Chemistry. London: Royal Society of Chemistry. p. 52. ISBN 0-85404-438-8.