1. Alexander, F. (1931). Psycho-anal. Rev., 18, 129.
2. Text Book of Psychiatry (Trans. Brill);Bleuler, E.,1924
3. John Addington Symonds;Brown, H.F.,1895
4. Cosmic Consciousness: A Study in the Evolution of the Human Mind;Correspondence. (Quoted James, op,1901
5. Lehrbuch der Geisteskrankheiten;Philadelphia, Pa. (Quoted James, op,1929