รายการอ้างอิง ของ ธาตุหายาก

↑ "News and events". US Department of Agriculture. สืบค้นเมื่อ 2012-03-13.
↑ Edited by N G Connelly and T Damhus (with R M Hartshorn and A T Hutton), ed. (2005). Nomenclature of Inorganic Chemistry: IUPAC Recommendations 2005 (PDF). Cambridge: RSC Publ. ISBN 0-85404-438-8. Archived from the original (PDF) on 2008-05-27. สืบค้นเมื่อ 2012-03-13.CS1 maint: Extra text: editors list (link)
1 2 C. R. Hammond, "Section 4; The Elements", in CRC Handbook of Chemistry and Physics, 89th Edition (Internet Version 2009), David R. Lide, ed., CRC Press/Taylor and Francis, Boca Raton, FL.
↑ Energy-efficient light bulbs containing yttrium
1 2 Gschneidner, Karl A., Jr. 1966. |title=Rare Earths-The Fraternal Fifteen. Washington, DC, U.S. atomic Energy Commission, Divisions of Technical Information, 42 pages.
1 2 Hedrick, James B. "REE Handbook -- The ultimate guide to Rare Earth Elements,". Rare Metal Blog. Toronto, Canada.

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