These include scholarly and peer reviewed publications. Often they can be primary research studies.
Click this link and take a few minutes to bowse this PG Library journal article. Pay attention to the information on the detailed record page, including Author, Source, and Abstract, as well as the HTML or PDF links on the left side of the screen.
Things to consider:
After browsing this item, can we trust that it passes the criteria as a credible academic 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.