1. C. E. Marshall, The Colloid Chemistry of the Silicate Minerals, Academic Press, New York (1949).
2. H. van Olphen, An Introduction to Clay Colloid Chemistry, Wiley, New York (1963).
3. S. Yariv and H. Cross, Geochemistry of Colloid Systems, Springer-Verlag, Berlin (1979).
4. R. E. Grim, in Kirk-Ottmer Encyclopedia of Chemical Technology, 3rd ed., vol. 6, pp. 207–223, Wiley, New York (1979).
5. R. E. Grim, Clay Mineralogy, 2nd ed., McGraw-Hill, New York (1968).