While most would consider this a straight up history book, it is fascinating to see how each profile uses communicating skills to become great leaders. DKG profiles four US Presidents; Lincoln, Teddy Roosevelt, FDR and LBJ, and looks at their leadership as a result of managing crisis. She shows that there are definite patterns and consistent approaches that work. A great read for any history buff.
Please feel free to comment on any of these recommendations and suggest other sources that might be helpful.