How would you distinguish between these kinds of periodicals?
How would you define a scholarly journal? Take into consideration the following:
There are several types of scholarly articles and communications. Generally, when you are looking for scholarly articles, you are looking for research articles, that is, articles that report original research. Depending on the discipline and methodology, research articles may vary a little in format but all will present a research question or hypothesis, a literature review, results of a study or analysis, and conclusions about the original research question or hypothesis. These parts may be identified as subheadings in the article, depending on the journal.
Scholarly articles will also be well-documented with references. Many will have a reference list or bibliography at the end of the article. Some journals also publish an abstract of the article at the beginning.