1. Bill Gates
http://paper.sznews.com/szdaily/20071031/ca2812526.htm
2. Warren Buffett
http://www.readerslab.com/2008/03/07/warren-buffett-biography/
3. Lee Ka Shing
http://www.referenceforbusiness.com/biography/F-L/Li-Ka-shing-1928.html
4. Michael Dell
http://www.notablebiographies.com/news/Ca-Ge/Dell-Michael.html
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