Some excellent tools for locating scholarly book reviews, are ProQuest, Academic Search Premier, and Literary Reference Center. The "best of the rest" include:
H-Net provides full text scholarly book reviews, 1993 to date, in the humanities and social sciences. Find below a sample list of scholarly reviews in military history written by academic contributors to H-Net. RSS feeds for reviews in other areas of history are available.
The following databases index and in most cases provide electronic reproductions of full-text primary source magazines, journals, and newspapers.