If you are using PrimoVE, you can find book reviews: Refine your results > Content Type > Reviews
Book reviews can often be found in other online resources specific to the subject matter of the book. For example, if you are looking for reviews of a book on sociology, you could search Sociological Abstracts and Sociology Database on the Sociology guide. This and many other databases allow you to restrict your search by article type to book reviews.
University of Michigan-Flint