1. Andrew, C., and Gordievsky, O. (1990) KGB: The Inside Story of Its Foreign Operations from Lenin to Gorbachev, Harper Collins, New York, NY.
2. Apter, D.E. (1965) The Politics of Modernisation, University of Chicago Press, Chicago, IL.
3. Baleanu, V.G. (1995) The Enemy Within: The Romanian Intelligence Service in Transition, Royal Military Academy Conflict Studies Research Centre, Camberley, Surrey.
4. Ball, D. (1989a) “Soviet Signals Intelligence: Vehicular Systems and Operations”, Intelligence and National Security, 4(1), January, pp. 29-44.
5. Ball, D. (1989b) Soviet Signals Intelligence SIGIN77: Intercepting Satellite Communications, Australian National University Strategic and Defence Studies Centre, Canberra.