I can recommend books, which should be easily obtained in most public libraries. These books follow the facts, Jesse died in 1882. If you want to read stories, of him leaving his family behind, and so forth, I cannot help you. Too many people have been gobbled up, in the hype which adheres to looking for gold and trying to be something other than who they really are. If you are serious:
Frank Triplett - The Life, Times and Treacherous Death of Jesse James. New York, New York. Promontory Press, 1970.
Homer Croy - Jesse James Was My Neighbor. New introduction by Richard E. Meyer. Lincoln: University of Nebraska Press, 1997.
William A. Settle - Jesse James Was His Name. Lincoln, Neb. University of Nebraska Press. 1977.
Robertus Love - The Rise and Fall of Jesse James.New York. G. P. Putnam's Sons, 1926.
I personally would also reccomend any book by authors: John Koblas, Marley Brandt and Ted Yeatman.