If you are interested in learning more
about Black Hawk, the Sauks and Foxes, and the Black Hawk War, you might
want to begin with these works:
William T. Hagan, The Sac and Fox Indians (Norman: University of Oklahoma Press, 1958). Though a bit dated now, this work still provides a very useful discussion of the Sauks and Foxes, including their histories after the Black Hawk War.
Donald Jackson, ed., Black Hawk: An Autobiography (Urbana: University of Illinois Press, 1955). There are numerous editions of Black Hawk's autobiography dating back to the 1830s; this one is perhaps the most readily available at present and includes a very helpful introduction.
Roger L. Nichols, Black Hawk and the Warrior's Path (Wheeling, Ill.: Harlan Davidson, Inc., 1992). This biography uses the story of Black Hawk's life to discuss the Sauks and Foxes and the Black Hawk War. It is thoroughly researched and clearly written.
Francis Paul Prucha, The Great Father: The United States Government and the American Indians, 2 vols. (Lincoln: University of Nebraska Press, 1984). This book provides a solid, general overview of federal policy toward Native Americans. As such, it is very valuable for placing the federal government's evolving policies toward the Sauks and Foxes in context.
William F. Stark, Along the Black Hawk Trail (Sheboygan, Wisc.: Zimmerman Press, 1984). This book would be especially useful for people interested in visiting the various places that figured in the Black Hawk War. Unfortunately, it is difficult to find.
Ellen M. Whitney, ed., The Black Hawk War, 1831-1832, 3 vols. (Springfield: Illinois State Historical Society, 1970). These volumes reprint literally hundreds of letters, militia muster rolls, and other documents generated by the Black Hawk War, particularly in Illinois. The introductory essay by Anthony F. C. Wallace presents a brief account of the events that led up to the conflict.