1. Butler, James N., Ionic Equilibria, Addison-Wesley, Reading, Massachusetts, 1964, Chapter 7.
2. de Levie, R., Ratio diagrams, J. Chem. Ed. 47, 187 (1970).
3. Freiser, Henry and Q. Fernando, Ionic Equilibrium in Analytical Chemistry. Wiley, New York, 1963, Chapters 4–7.
4. Guenther, W. B., Quantitative Chemistry, Addison-Wesley, Reading, Massachusetts, 1968, Chapters 5 and 8.
5. Ricci, John E., Hydrogen Ion Concentration, Princeton University Press, Princeton, New Jersey, 1952.