NAHF - Howard Hughes - Biography provided by the National Aviation Hall of Fame. - http://nationalaviation.blade6.donet.com/components/content_manager_v02/view_nahf/htdocs/menu_ps.asp?NodeID=1527562866&group_ID=1134656385&Parent_ID=-1
Howard R. Hughes, Jr. - The Record Setter - Essay format biography with bibliography provided by the U.S. Centennial of Flight Commission. - http://www.centennialofflight.gov/essay/Explorers_Record_Setters_and_Daredevils/Hughes/EX28.htm
Howard Hughes - Biography of the reclusive billionaire aviator, movie producer and businessman, from answers.com. - http://www.answers.com/topic/howard-hughes