The World's Billionaires 2011
The World's Billionaires 2011 edition was the 25th annual ranking of The World's Billionaires by Forbes magazine. The list estimated the net worth of the world's richest people, excluding royalty and dictators, as of February 14, 2011.
Source: Wikipedia — The World's Billionaires 2011 (CC BY-SA 4.0)