Kiefer, David M. (februarie 2002). „Soda Ash, Solvay Style”. Today's Chemist at Work. 11 (2): 87–88, 90. Arhivat din original la . Accesat în . Online version archived at WebCite from this original URL on 2008-03-12.
Kostick, Dennis (2006). "Soda Ash", chapter in 2005 Minerals Yearbook, United States Geological Survey. See Table I.
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Kiefer, David M. (februarie 2002). „Soda Ash, Solvay Style”. Today's Chemist at Work. 11 (2): 87–88, 90. Arhivat din original la . Accesat în . Online version archived at WebCite from this original URL on 2008-03-12.