Do textbooks have a DOI (Digital Object Identifier)?

Not all textbooks have DOIs, but an increasing number do. While not universally required, publishers are increasingly assigning DOIs to textbooks, especially those in digital formats or with online components. The presence of a DOI depends on the publisher and the specific edition of the textbook. You'll need to check the textbook itself (often on the title page or copyright page) or the publisher's website to determine if a DOI exists.