The articles in scholarly/academic journals (Art History, Economic Review) are written by scholars/researchers, and may contain articles that have gone through a "peer review" process - the articles were critically assessed by scholar's in the author's field of specialty. The articles will be documented with footnotes and a bibliography.
The articles in popular magazines (Newsweek, Ebony) are written by staff writers and journalists and reviewed by an editor. These publications are aimed at the general public. The articles are written to entertain, inform or elicit an emotional response.The articles are not documented. (No footnotes or bibliography attached.)