(EN) W. H. Brock, D. M. Knight, 1, in The Atomic Debates: "Memorable and Interesting Evenings in the Life of the Chemical Society", Isis, vol. 56, The University of Chicago Press, 1965, pp. 5-25, DOI:10.1086/349922, ISSN 0021-1753 (WC · ACNP).
(EN) George B. Kauffman, 3, in American forerunners of the periodic law, Journal of Chemical Education, vol. 46, marzo 1969, pp. 128–135 (132), Bibcode:1969JChEd..46..128K, DOI:10.1021/ed046p128.
(EN) W. H. Brock, D. M. Knight, 1, in The Atomic Debates: "Memorable and Interesting Evenings in the Life of the Chemical Society", Isis, vol. 56, The University of Chicago Press, 1965, pp. 5-25, DOI:10.1086/349922, ISSN 0021-1753 (WC · ACNP).
(EN) George B. Kauffman, 3, in American forerunners of the periodic law, Journal of Chemical Education, vol. 46, marzo 1969, pp. 128–135 (132), Bibcode:1969JChEd..46..128K, DOI:10.1021/ed046p128.
(EN) D. C. Hoffman, F. O. Lawrence, J. L. Mewherter, F. M. Rourke, 5325, in Detection of Plutonium-244 in Nature, Nature, vol. 234, 1971, pp. 132-134, Bibcode:1971Natur.234..132H, DOI:10.1038/234132a0.
(EN) Q. A. Elliot, 5, in A modification of the periodic table, Journal of the American Chemical Society, vol. 33, 1911, pp. 684–688 (688), DOI:10.1021/ja02218a004.
(EN) Xuefang Wang, Lester Andrews, Sebastian Riedel, Martin Kaupp, 44, in Mercury Is a Transition Metal: The First Experimental Evidence for HgF4, Angewandte Chemie International Edition, vol. 46, 2007, pp. 8371-8375, DOI:10.1002/anie.200703710, PMID17899620.
(EN) George B. Kauffman, 3, in American forerunners of the periodic law, Journal of Chemical Education, vol. 46, marzo 1969, pp. 128–135 (132), Bibcode:1969JChEd..46..128K, DOI:10.1021/ed046p128.
(EN) D. C. Hoffman, F. O. Lawrence, J. L. Mewherter, F. M. Rourke, 5325, in Detection of Plutonium-244 in Nature, Nature, vol. 234, 1971, pp. 132-134, Bibcode:1971Natur.234..132H, DOI:10.1038/234132a0.
(EN) Jeffery Leigh, Periodic Tables and IUPAC, su iupac.org, Chemistry International: The News Magazine of The International Union of Pure and Applied Chemistry (IUPAC). URL consultato il 23 marzo 2011.
(EN) E. Scerri, 4, in Mendeleev's Periodic Table Is Finally Completed and What To Do about Group 3?, Chemistry International, vol. 34, 2012.
(EN) D. C. Hoffman, F. O. Lawrence, J. L. Mewherter, F. M. Rourke, 5325, in Detection of Plutonium-244 in Nature, Nature, vol. 234, 1971, pp. 132-134, Bibcode:1971Natur.234..132H, DOI:10.1038/234132a0.
(EN) Xuefang Wang, Lester Andrews, Sebastian Riedel, Martin Kaupp, 44, in Mercury Is a Transition Metal: The First Experimental Evidence for HgF4, Angewandte Chemie International Edition, vol. 46, 2007, pp. 8371-8375, DOI:10.1002/anie.200703710, PMID17899620.
(EN) Q. A. Elliot, 5, in A modification of the periodic table, Journal of the American Chemical Society, vol. 33, 1911, pp. 684–688 (688), DOI:10.1021/ja02218a004.
(EN) Xuefang Wang, Lester Andrews, Sebastian Riedel, Martin Kaupp, 44, in Mercury Is a Transition Metal: The First Experimental Evidence for HgF4, Angewandte Chemie International Edition, vol. 46, 2007, pp. 8371-8375, DOI:10.1002/anie.200703710, PMID17899620.
(EN) W. H. Brock, D. M. Knight, 1, in The Atomic Debates: "Memorable and Interesting Evenings in the Life of the Chemical Society", Isis, vol. 56, The University of Chicago Press, 1965, pp. 5-25, DOI:10.1086/349922, ISSN 0021-1753 (WC · ACNP).
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Johann Wolfgang Dobereiner, su chemed.chem.purdue.edu. URL consultato il 1º settembre 2013 (archiviato dall'url originale il 14 novembre 2014).
Sviluppo storico della tavola periodica, su tavolaperiodica.unicam.it, Università di Camerino. URL consultato il 18 febbraio 2014 (archiviato dall'url originale il 24 febbraio 2015).
(EN) Missing link element created., TgDaily, 7 aprile 2010. URL consultato il 10 aprile 2010 (archiviato dall'url originale il 10 aprile 2010).
(EN) W. H. Brock, D. M. Knight, 1, in The Atomic Debates: "Memorable and Interesting Evenings in the Life of the Chemical Society", Isis, vol. 56, The University of Chicago Press, 1965, pp. 5-25, DOI:10.1086/349922, ISSN 0021-1753 (WC · ACNP).
Kotz, p. 324. (EN) John C. Kotz, Paul M. Treichel, John Raymond Townsend, Chemistry and Chemical Reactivity, vol. 2, 7ª ed., Belmont, Thomson Brooks/Cole, 2009, ISBN978-0-495-38712-1, OCLC220756597.