Хемијска формула — разлика између измена

* {{Cite book |ref= harv|title= General Chemistry: Principles and Modern Applications |edition= 8th |publisher= Prentice-Hall |year= 2002 |chapter= 3 |author= Ralph S. Petrucci, |author2 = William S. Harwood, |author3 = F. Geoffrey Herring |id=ISBN 0-13-198825-5 |oclc=46872308}}