1. Gibbs, J. Willard. Collected Works, Vol. II (Yale University Press, 1928), p. 167. Also: Commentary on the Scientific Writings of J. Willard Gibbs, ed. by F. G. Donnan and A. E. Haas (Yale University Press, 1936), p. 37; and, Principles of Statistical Mechanics, by R. C. Tolman (Oxford University Press, 1938), p. 626.
2. Landé, A. Quantum mechanics and thermodynamic continuity. Am. Jour. Physics, 20, 353, 1952.
3. Landé, A. Thermodynamic continuity and quantum principles. Phys. Rev., 87, 267, 1951.
4. Reichenbach, Hans. Philosophic Foundations of Quantum Mechanics (University of California Press, 1944), p. 42.
5. Bohr, Niels. “Discussion with Einstein,” in A. Einstein, Philosopher-Scientist, Library of Living Philosophers, P. A. Schilpp, ed. (Tudor Publishing Co., Evanston, III., 1951), p. 200.