1. About.com. (2009). Symmetrical balance. Retrieved July 29, 2009, from Desktop publishing: Principles of design: http://desktoppub.about.com/od/designprinciples/l/aa_balance1.htm .
2. Adair, J. (2009). Leadership for innovation. London: Kogan Page.
3. Adams, J. L. (1990). Conceptual blockbusting: A guide to better ideas. New York: Basic Books.
4. Axelrod, A. (2008). Edison on innovation. San Francisco: John Willey & Sons.
5. Brown, K. (1997, March). IEEE expert: Intelligent systems and their applications archive. Retrieved December 11, 2008, from ACM Portal: http://portal.acm.org/citation.cfm?id=630215#abstract .