Orica. Sodium hydroxide. April 1999. Internet <http://www.orica.com/Business%5CCor%5Cwcor00013.nsf/approvedbyid/B9473A8A3B5F7EAA4A25674E001D8DA7?OpenDocument>. October 2001
Baker. Sodium Hydroxide Solutions and Concentrations. August 1998. Internet <http://www.jtbaker.com/msds/s4034.htm>. October 2001
Donnees. Production of NaOH. NA. Internet <www.sfc.fr/Donnees/mine/naoh/texnaoh.htm>. October 2001
Twardowski, Zbigniew. Combined process for production of chlorine dioxide and sodium hydroxide. July 1997. Internet<http://clo2.com/reading/patents/combined.html>. October 2001
Plambeck, Jones A. Introductory University Chemistry. September 1995. Internet<http://www.chem.ualberta.ca/courses/plambeck/p102/p02114.htm>. October 2001
kirk, Othmer. Year 2000. Encyclopedia of chemical Engineering, fourth Edition. October 2001
Microsoft Encarta 99 Encyclopedia. Feb 1999. October 2001