1. The age of heretics: heroes, outlaws, and the forerunners of corporate change;Kleiner,1996
2. Scenario planning;Coates;Technol. Forecast. Soc. Change,2000
3. The art of the long view: planning for the future in an uncertain world;Schwartz,1996
4. Thought experimentation in pre-Socratic philosophy in Tamara Horowitz and Gerald J. Massey;Rescher,1991
5. The alternative world futures approach;Kahn,1973