1. Managing the new product development process;Imai,1984
2. Traits of creativity;Guildford,1959
3. J. Kawakita, Hassou-hou, Chukou shinsho, 1967 (in Japanese).
4. Applied Imagination: Principles and Procedures of Creative Thinking;Osborn,1963
5. The Metaphor Machine: a database method for creativity support;Young;Decis. Supp. Syst.,1987