Butow, Robert J.C. Japan's Decision to Surrender. Stanford: Stanford University Press, 1954. Print.
This trade paperback is both history and political science. Dr. Butow deals in great detail with the tangled events. The material ranges from official records to personal interviews and correspondence with many of the Japanese involved. It is a definitive account of the men, events, policies, politics and pressures that contributed to Japan's decision to surrender.