The Billionaire list is compiled from information from primary Wikipedia, which again in some extent is based on the information published by the Forbes web site. Parts of the information is researched on own initiative from other sources on the Internet. There have been made some efforts to try to make this information as correct as possible. However if you are going to use this information in some text where you would like to have accurate information you are advised to try to cross check it with other sources. The information is provided as is without any guarantees.