1. Ruth G. Shaeffer, Developing Strategic Leadership, The Conference Board, New York, Report No. 847, p. 2 (19??).
2. The confusing words of business policy;Leontiades;Academy of Management Review,1982
3. Theory in practice;Koontz;Harvard Business Review,1962
4. Business Strategy;Igor Ansoff,1969
5. Corporate strategy: the state of strategic planning;Porter;The Economist,1987