The primary sources are required in the scholarly literature where the facts and quotes can be verified unlikely, the primary sources in other periodicals which are rare and scanty.
The primary sources are stated as the first report of research, published as a journal article, a book or book chapter, etc. As it includes the methodology, data and results, also the discussions.
They are incomplete snippets of history, in which each represents a mystery that only students can explore by finding new parts of evidence. It also helps the students to feel related to the source/research in person, and promotes deeper understanding among them.
A secondary source is scholarly or can be other analyses of a primary source made by a person who somewhere is connected(indirectly).
It is so because a periodical is a publication with multiple articles which appears more than once, usually on a regular basis. As they provide recent information in comparison to books (which are the primary source), for example- magazines, journals, and newspapers, etc.
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