1. Scanning the Business Environment;Aguilar,1967
2. The Concept of Corporate Strategy;Andrews,1971
3. Evaluating of technical change;Bright;Harvard Business Review,1970
4. James R. Bright and Milton E.F. Schoeman (Eds.), A Guide to Practical Technological Forecasting, Prentice-Hall, Englewood Cliffs, New Jersey.
5. Designing information systems for strategic decisions;Hayes;Long Range Planning,1974