A great "meta" review of the literature is J. Samuel Walker, "Recent Literature on Truman’s Atomic Bomb Decision: A Search for Middle Ground," Diplomatic History 29, no. 2 (April 2005), 311-334. It goes over a lot of the literature and lists the key ones.

But basically, for the old-school "revisionist" accounts, see Martin Sherwin, A World Destroyed and Gar Alperovitz, The Decision to Use the Atomic Bomb. For "traditionalist" accounts, see Robert Newman, Truman and the Hiroshima Cult and D.M. Giangreco, Hell to Pay. For a more "fresh" take that traditionalists think is revisionist, see Hasegawa, Racing the Enemy. For a deliberately middle-of-the-road take, see J. Samuel Walker, Prompt and Utter Destruction.