What to look for:
- volume/issue information
- described as "trade" or "occupational"
- geared towards a particular occupation
When viewing in Search@UW:

When viewing in a database, such as ABI/INFORM Collection:

If you're not sure what type of article you're looking at, try a Google search for the source's name and read more about it:

In this example, Ad Age is described as a magazine and media brand, but its focus on marketing and media indicates that it is geared toward people in a particular industry and not the general public.