1. Symmetry and spontaneously broken symmetry in physics of elementary particles;Mannheim;Comput. Math. Applic.,1986
2. Elementarity and reality in particle physics;Wallace,1968
3. Physics in Perspective, p. 19. National Research Council (U.S.), Physics Survey Committee, Washington National Academy of Sciences (1972).
4. Physics Through the 1990's, p. 13. Elementary Particle Physics, National Academy of Sciences, U.S.A. (1986).