1. See for example, F. D. Rossini,Chemical Thermodynamics, (John Wiley and Sons, Inc., New York, 1950), p. 232.
2. S. Glasstone,Thermodynamics for Chemists(D. Van Nostrand Company, Inc., New York, 1947), p. 239.
3. G. N. Lewis and M. Randall,Thermodynamics(McGraw-Hill Book Company, Inc., New York, 1923), p. 215.
4. The Collected Works of J. Willard Gibbs(Yale University Press, New Haven, Connecticut, 1948), Vol. I, p. 98.
5. F. E. W. Wetmore and D. J. LeRoy,Principles of Phase Equilibrium(McGraw-Hill Book Company, Inc., New York, 1951), p. 76.