Good, John Mason; Gregory, Olinthus; Bosworth, Newton (1819). "Scheele (Charles William)". Pantologia A new cabinet cyclopaedia, comprehending a complete series of essays, treatises, and systems, alphabetically arranged; with a general dictionary of arts, sciences, and words. London: J. Walker. ISBN1179565665. Retrieved 31 March 2015. {{cite book}}: ISBN / Date incompatibility (help)
Pyykkö, Pekka and Orama, Olli (1996). "What did Johan Gadolin actually do?"(PDF). In Evans, C. H. (ed.). Episodes from the History of the Rare Earth Elements. Dordrecht: Kluwer. pp. 1–12.{{cite book}}: CS1 maint: multiple names: authors list (link)
lanl.gov
periodic.lanl.gov
"Gadolinium". Periodic Table of Elements: LANL. Retrieved 31 March 2015.
minrec.org
"GADOLIN, Johan". The Mineralogical Record, Inc. Retrieved 1 April 2015.