Marshall McLuhan, Understanding Media, McGraw Hill, New York, 1964.
2.
Eric Erikson , "Growth and Crises of the Healthy Personality ", Psychological Issues, Vol. L, No. I, International Universities Press, New York, 1959.
3.
Abraham Maslow , "A Theory of Metamotivation, the Biological Rooting of the Value-Life", Journal of Humanistic Psychology , Vol. VII, No. 2, Fall, 1967, reprinted in Psychology Today, Vol. II, No.2, Los Angeles, California, July 1968.
