Where you should search depends upon your topic.
Best databases for belief would be either PsychINFO, ATLA, or Philosopher's Index.
If you're looking at belief in a particular subject area, then take a look at a subject-specific database (for example, business, health, or education).
Image Source: Saffron Blaze. W. Lloyd MacKenzie. Ruins of the Temple of Apollo, Side, Antalya, Turkey. CC BY-3.0. Wikimedia Commons.
Primo is a discovery search tool that you can use to begin your research or to find additional resources.
Primo does not search everything the library has access to; it should not be used exclusively. It can, however, be a valuable additional resource.
Locate journal articles on beliefs in the databases below.