Brown, Theodore L.; LeMay, H. Eugene; Bursten, Bruce E.; Murphy, Catherine J.; Woodward, Patrick (2013). Chemistry: The Central Science (3rd ed.). Frenchs Forest, NSW: Pearson/Prentice Hall. pp. 5–6. ISBN9781442559462. Arquivado dende o orixinal o 2021-05-31. Consultado o 2020-12-08.
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Hill, John W.; Petrucci, Ralph H.; McCreary, Terry W.; Perry, Scott S. (2005). General Chemistry (4th ed.). Upper Saddle River, NJ: Pearson/Prentice Hall. p. 6. ISBN978-0-13-140283-6. Arquivado dende o orixinal o 2009-03-22.
web.archive.org
Brown, Theodore L.; LeMay, H. Eugene; Bursten, Bruce E.; Murphy, Catherine J.; Woodward, Patrick (2013). Chemistry: The Central Science (3rd ed.). Frenchs Forest, NSW: Pearson/Prentice Hall. pp. 5–6. ISBN9781442559462. Arquivado dende o orixinal o 2021-05-31. Consultado o 2020-12-08.
Hill, John W.; Petrucci, Ralph H.; McCreary, Terry W.; Perry, Scott S. (2005). General Chemistry (4th ed.). Upper Saddle River, NJ: Pearson/Prentice Hall. p. 6. ISBN978-0-13-140283-6. Arquivado dende o orixinal o 2009-03-22.