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Dyfyniad Arddull ChicagoEnghg, Per. Encyclopedia of the Elements: Technical Data, History, Processing, Applications. Berlin: Wiley VCH, 2004.
Dyfyniad MLAEnghg, Per. Encyclopedia of the Elements: Technical Data, History, Processing, Applications. Berlin: Wiley VCH, 2004.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.