1. 3 P.M.H. Atwater (1988 )Coming back to life: The aftereffects of near-death experience. Ballantine Books, New-York.
2. 4 G.H. Elder (1985 )Life Course Dynamics. Trajectories and Transitions. 196880. Cornell University Press, London.
3. 5 E. Freidson (1970 )Profession in Medicine: a Study of the Sociology of Applied Knowledge. Harper Row, New York.