1. Probing the future;Amara,1978
2. Theory and practice of integrated impact assessment;Ballard;Technological Forecasting and Social Change,1984
3. Global Simulation Models: A Comparative Study;Clark,1975
4. Long-term forecasting methods: emphasis and institutions;Cole;Futures,1976
5. Prognostics, futuristics, futuribles: what shall we call the study of the future?;Cornish;The Futurist,1977