Кислород: юрамалар арасында аерма

* Atomic Weights of the Elements 2001, [http://www.iupac.org/publications/pac/2003/7508/7508x1107.html Pure Appl. Chem. 75(8), 1107—1122, 2003]. Retrieved June 30, 2005. Atomic weights of elements with atomic numbers from 1-109 taken from this source.{{ref-en}}

* [http://www.iupac.org/news/archives/2005/atomic-weights_revised05.html IUPAC Standard Atomic Weights Revised] (2005).{{ref-en}}

 

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