I have a 300+ page booklet on the Ferguson families (there are several that do not claim to be related to each other). I know that they are! The Fergusons came from the Vera / Hixburg area of Appomattox County, Virginia. This area was Buckingham County prior to 1845 and the formation of Appomattox County. I have worked on the Ferguson Family for about 25 years.
Let me know if you are interested in a book. I have spent quite a bit of time and money doing research, but am not a genealogist. I can not guarantee that all of the info in the booklet is 100% accurate. I did my best and am still working on it.