* {{en}} [http://www.iupac.org/reports/provisional/abstract04/connelly_310804.html IUPAC Provisional Recommendations for the Nomenclature of Inorganic Chemistry (2004)] (online draft of an updated version of the "''Red Book''")
* {{en}} [http://www.acdlabs.com/iupac/nomenclature/ IUPAC Nomenclature of Organic Chemistry] (online version of the "''Blue Book''")
* {{en}} [http://www.chem.qmul.ac.uk/iupac/ IUPAC Recommendations on Organic & Biochemical Nomenclature, Symbols, Terminology, etc.] (includes IUBMB Recommendations for biochemistry)
* {{en}} [http://www.iupac.org/reports/1993/homann/index.html IUPAC Abbreviated list of quantities, units and symbols in physical chemistry] (online version of the "''Green Book''")
* {{en}} [http://www.iupac.org/publications/compendium/index.html IUPAC Compendium of Chemical Terminology] (online version of the "''Gold Book''", from [[IUPAC]])
* {{en}} [http://www.chemsoc.org/cgi-shell/empower.exe?DB=goldbook IUPAC Compendium of Chemical Terminology] (online version of the "''Gold Book''", from the [[Royal Society of Chemistry|RSC]], allows free text searching.)