A journal article is going to be basically a magazine, for people in the field....that a normal person wouldn't read. They are usually peer reviewed, and the journal which they are in has no pretty pictures or advertisements. They usually are not monthly editions; usually less often like a few times a year. The titles of the articles are very long and descriptive.
The journal articles are usually obtained through the library'* website of the college you are attending. The library pays a pretty penny for you to access them. If you are not going to a college (and are doing this just for fun
) I have access to two different college databases which I could use to find them for you. I would just need a very specific description on what you are writing about.
EDIT cuz my memory sucks right now.
Sorry, but I cannot help you with APA as we all use MLA around here....