1. A. H. Morrish, The Physical Principles of Magnetism (John Wiley, New York, 1965).
2. S. Chikazumi, Physics of Magnetism (John Wiley, New York, 1964).
3. K. Yosida, Theory of Magnetism (Springer, New York, 1996).
4. R. M. White, Quantum Theory of Magnetism (Springer, New York, 1983).
5. C. J. Ballhausen, Molecular Electronic Structures of Transition Metal Complexes (W & J Mackay,Chatham, England, 1979).