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All Music Guide
http://www.allmusic.com/cg/amg.dll?p=amg&sql=11:z95f8qntbtc4
Biography by Jason Ankeny, and discography.
Encyclopedia.com
http://www.encyclopedia.com/html/j/jacksom1a.asp
Biography and related resources by Electric Library.
Rock and Roll Hall of Fame
http://www.rockhall.com/hof/inductee.asp?id=126
Inductee profile and timeline.