1. Future problems have their roots in today's trends. The main approach to identifying and bounding coming problems must be through forecasting the emergence or evolution of present and foreseeable trends and events,1975
2. Comparison of Delphi forecasting studies in 1964 and 1969;Ament;Futures,1970
3. The prediction of inventions;Gilfillan,1937
4. The major determinants of the prediction of social events;McGregor;Journal of Abnormal and Social Psychology,1938
5. The prediction of social and technological events;Kaplan;Public Opinion Quarterly,1950