1. T. H. Qualter, Propaganda and Psychological Warfare (New York: Random House , 1962), p. 27.
2. J. N. Roscnau & others (Eds.), World Politics: An Introduction ( New York: Free Press, 1976), p. 360.
3. International Herald Tribune, 25 March 1977 .
4. E.T. Lean, Voices in the Darkness: The Story of the European Radio War ( London: Seeker & Warburg, 1943 ), p. 60.