Sources

http://[|great-scientists.suite101.com/article.cfm/the_atomic_bomb_and_its_beginnings]

http://[|www.trivia-library.com/a/origin-of-famous-inventions-and-inventors-atomic-bomb.htm]

http://[|library.thinkquest.org/16541/eng/learn/library/content/atomicbomb.htm]