Grup 4 de la taula periòdica (Catalan Wikipedia)

Analysis of information sources in references of the Wikipedia article "Grup 4 de la taula periòdica" in Catalan language version.

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alkane.com.au

betanews.com

bnf.fr

gallica.bnf.fr

britannica.com

cbmm.com.br

cdc.gov

  • «Zirconium Compounds». National Institute for Occupational Health and Safety, 17-12-2007. [Consulta: 17 febrer 2008].

doi.org

dx.doi.org

google.cat

books.google.cat

harvard.edu

adsabs.harvard.edu

ilo.org

iupac.org

lanl.gov

periodic.lanl.gov

osha.gov

rsc.org

usgs.gov

minerals.usgs.gov

minerals.er.usgs.gov

  • Hedrick, James B. «Hafnium» (PDF). United States Geological Survey. [Consulta: 10 setembre 2008].

washingtonpost.com

web.archive.org

webelements.com