Some things to look for to comment on would be
- The purpose for writing the book and who or what audience it is intended to reach.
- What thesis the author is supporting.
- What additional help will this book give in understanding a topic or discipline.
- If the material presented is primary or secondary, or what other material is included.
- If the author backs up their research with other references or a bibliography.
For other thoughts, see the list of links in the topics on the left side of this page.