1. Gibbs, F. A. and Gibbs, E. L.: Atlas of Electroencephalography, Vol. 1. Addison-Wesley Press, Inc., Cambridge. 1950, pp. 44, 55, 78, 118, 160, 162.
2. Kugler, J.: Electroencephalography in Hospital and General Consulting Practice. Elsevier Publishing Company, Amsterdam, 1964, pp. 26–28.
3. Schwab, R. S.: Electroencephalography in Clinical Practice. W. B. Saunders Company, Philadelphia. 1951, pp. 58–67.