Suggested Reading
Csikszentmihalyi, M. (1997). Creativity: flow and the psychology of discovery and invention. Harper Perennial.  Read about: http://en.wikipedia.org/wiki/Mihaly_Csikszentmihalyi. 

Koestler A. (1964). The act of creation. Hutchinson & Col.  Read about: http://en.wikipedia.org/wiki/The_Act_of_Creation. 

Simonton, DK (1999). Genius, creativity, and leadership: histriometric inquiries. IUniverse.

Simonton, DK. (1988). Scientific genius: a psychology of science. Cambridge University Press.

Wallas, G. (1926). The art of thought . Harcourt. Read about: http://en.wikipedia.org/wiki/Creativity#Graham_Wallas.