Wikipedia:Articles on sources
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Wikipedia should ideally have, so far as its policies and guidelines allow, an article on every substantial publication that is likely to be used as a source for Wikipedia, and on the author and publisher of every such publication.
Why
Articles allow for a central summary of the source from other Wikipedia:reliable sources. This can be useful context for editors choosing which sources to add as well as when discussing potential perennially reliable sources.
Sources with little or no coverage on Wikipedia
What if Wikipedia does not have an article discussing a source? Editors who take any time to update those articles on sources are celebrated and very much appreciated by other Wikipedians for helping to broaden the knowledge base about sources, which are foundational to Wikipedia.