Many scholarly journals include book reviews. You can search for book reviews by adding “review” to your search.
For example:
Topic and source type: genocide and review (for list of reviews on multiple book titles about the topic of genocide).
Title and source type: Genocide and the Holocaust and review (for list of reviews of this particular book title).
Book Review Digest Retro 1903-1982 Under Databases on library website
Book reviews and selected full-text books.
Book Review Digest Plus Under Databases on library website
Current book reviews and citations to book
reviews and selected full-text books.
Choice Reviews Under Databases on library website
Source of reviews of academic books, electronic media,
and internet sources.