This is a list of books I personally recommend (and have used) for research on Adolf Hitler.
Adolf Hitler- A Collection of Speeches.http://www.hitler-speeches.com.
Flood, Charles Bracelen. Hitler, The Path to Power. Houghton Mifflin Company, 1989.
Heyes, Eileen. Children of the Swastika: The Children Youth. The Millbrook Press, 1993.
Hitler, Adolf. Compton's Interactive Encyclopedia. Compton's New Media, Inc., 1995.
The Rise of Hitler- The History Place. http://www.historyplace.com/worldwar2/riseofhitler/index.htm.
Turner, Henry Ashby. Hitler- Memoirs of a Confidant. Yale University, 1985.
Turner, Henry Ashby. Hitler's Thirty Days to Power: January 1933. Addison-Wesley Publishing Company, 1996.
Wolfe, Burton H. Hitler and the Nazis. G.P. Putnam's Sons, 1970.