Periodicals includes magazine articles, newspapers articles, journal articles etc. Journal articles are often scholarly or peer-reviewed.
What can help you determine if an article is from a peer-reviewed journal?
1) Database Filters/Tagging - often alert you to the source type
2) Article Structure - be aware of the article's characteristics often alerts you to the source type e.g. length, bibliography, tone
3) Tools like Ulrichs - look for a title, will indicate if it is peer reviewed check if it is peer reviewed status
Not sure if an article is scholarly or popular? Ulrichs has detailed information on more than 300,000 publications. Enter journal/magazine title in the search box and find your publication. Then, look for Academic/Scholarly in the Content Type field.
Profiles nearly a quarter of a million consumer and trade magazines, academic and scholarly publications, monographic series, newsletters, newspapers, electronic publications, 'zines, and many other types of serial publications on all subjects.