Trade Publications
Trade sources are also known as industry magazines (e.g., AdWeek, Publisher's Weekly, Forbes, etc.).
Click this link and take a few minutes to browse this PG Library trade article. Pay attention to the information on the detailed record page, including Author, Source, and Abstract.
Things to consider:
After browsing this item, can we trust that it passes the criteria as a credible trade publication? If answering yes, then chances are it is a source of credible information. If answering no, then you may want to consider an alternate source.