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== Referensi ==
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* BookRags, [http://www.bookrags.com/periodictable/ Periodic Table] {{Webarchive|url=https://web.archive.org/web/20090303165806/http://www.bookrags.com/periodictable/ |date=2009-03-03 }}.
* World Book Encyclopedia, [https://web.archive.org/web/20090421205808/http://www.worldbook.com/wb/Students?content_spotlight%2Fearth%2Fexploring Exploring Earth].
* HyperPhysics, Georgia State University, [http://hyperphysics.phy-astr.gsu.edu/hbase/tables/elabund.html Abundance of Elements in Earth's Crust].
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