Journals are often called scholarly publications. Scholarly articles are written by professors or researchers in a discipline. The articles generally go through a rigorous peer review process before publication. That is, they are submitted to other top researchers in the field for evaluation prior to being accepted for publication. If the article is not considered credible and valuable, it will not be published. This process assures that the information in the article is authoritative and of importance to the field.
The audience for journal articles is often other researchers in the discipline. This means that you will need to have enough background information about it to be able to fully understand the articles in some journals. On the other hand, journal articles will nearly always have a bibliography of sources. These bibliographies can be an invaluable source of additional places to find information pertinent to your topic.
Some examples of journals (among many others) that might help us with our topic include: