Business stripped bare : adventures of a global entrepreneur / Richard Branson (2008)
Like a Virgin : secrets they won't teach you at business school / Richard Branson (2012)
Will read more about Elon Musk at some later time. Read enough for now.
Robert Kiyosaki is a complete nut, may he enjoy a rapid death. tuscl.net
SJG
Want some books written by someone else, to read first:
Richard Branson, Virgin king : inside Richard Branson's business empire / Tim Jackson. (1996)
Business the Richard Branson way : 10 secrets of the world's greatest brand builder / by Des Dearlove (1999)
Richard Branson : Virgin megabrand mogul / Shirley Raye Redmond (2011)
There are other newer books too.
SJG