Here are a few additional considerations when evaluating books for your project.
Authors: Look for background information about the author, such as educational experience, previously published research, or whether an author has been cited in other research. You can often find biographical details and affiliations for the author in the book itself.
Bibliographies: Look for a bibliography in your book or look for your book in a bibliography. Scholarly, well-researched books will include bibliographies or lists of consulted source materials used. You might also come across a bibliography through which you find a book you might consult for your project.
Publishers: Who published the book? If your publisher does not fall under a category below, it may still be scholarly. However, you may want to look closely at other criteria in this guide to make further determinations.
The above content is adapted from Colorado State University Library's page "How to Evaluate Books"