Scholarly book reviews:

- provide alternative interpretations
- alert us to errors (we aren’t necessarily experts, the reviewers are)
- enable us to understand the thrust of what a writer is saying
- give us insight into where the writer is placed in the world of scholarship.

Google Scholar - search by title and author.

H-Net - notable review site maintained by an international consortium of scholars and teachers.

Te Waharoa 
A number of the Library-subscribed databases have reviews. These can be located in Te Waharoa.