1. Peter F. Drucker, “The discipline of Innovation”
2. Bruce D. Henderson, “The origin of strategy”, Harvard Business Review, November-December 1989
3. Nicolas Danila, “Strategie evaluation and selection of R&D projects”, R&D Management, Vol. 19, 1989
4. Kazuo Sumii, “Innovation management” (in Japanese), Japan Economic Newspaper Press, 1986
5. Shuji Kondo, “Approach to new product and new business”, Japan Management Association, 1989