1. E.F. Bouchard, E.G. Meritt, Citric acid, in: Kirk–Othmer Encyclopedia of Chemical Technology, third ed., vol. 6, Wiley-Interscience, New York, 1984, pp. 150–176.
2. N.P. Kaplan, N.P. Colowick, J.M. Lowenstein, Methods in Enzynology. Citric Acid Cycle, vol. 13, Acad. Press, Boston, 1969.
3. Resolution of the Dissociation Constants of Citric Acid at 0 to 50°, and Determination of Certain Related Thermodynamic Functions
4. A Physicochemical Study of Aqueous Citric Acid Solutions.