The main search tool for UA Libraries, Scout allows you to search the catalog, most of the libraries' databases, and the digital repository Acumen. Scout is a great place to start a broad search on a topic, but more targeted searching may be more successful in the catalog or subject-specific databases.
If you want to access to a specific database, you'll find it here. You can filter the list alphabetically, or browse databases by subject area or type of materials.
If the book or article you need is not available through the University Libraries, you can use Interlibrary Loan (ILL) to request a copy from another library.