Subject headings are standardized words or phrases assigned to a subject. They are categories of information. If you search by one, you will retrieve results that have the same tagged term.
You can search for books that you know, such as your course books, and see what subject headings they have as another way to search for similar topic items.
Example subject headings are below:
| Police -- community relations -- United States | Prosecution -- Decision making |
| Law reform | Criminal justice, Administration of -- United States |
| Imprisonment | Prisons -- United States |
