Contact a librarian in your area of interest!
Strategies for finding reviews often differ by subject, so we have librarians in various subject areas who can help you find what you need.
In Mirlyn, the library's online library catalog, you can find print book review sources using various subject phrases, like:
Here are several resources that are international in scope (and the first two cover a large time span):
Here is a demonstration of how to search for book reviews in JStor.