Relevant Sources
1. Compton’s Interactive Encyclopedia (1995)
2. Boyer, C. B. A History of Mathematics, Second Edition, John Wiley & Sons (1991), p.611
3. “Time” special issue on “Scientists & Thinkers of the 20th Century”, March 29, 1999, Vol 153 No. 12, pp. 64-205
4. http://www.clarku.edu/~hmarek/html/godel.html (This is an instructive place on www)
5. http://www.clarku.edu/~hmarek/html/disc.html