The Crown guide to the world's great plays, from ancient Greece to modern times, PN6112.5 .S45 1984. The history of world theater, PN2104 .B413 1991. Dictionary of literary biography, PS221 .D45. They can be magazines, journals, or newspapers. These two types of publications serve different purposes and different audiences.
Authors are scholars or researchers in their fields.
Authors cite their sources in footnotes, endnotes, and bibliographies. Individual issues have little or no advertising. Articles must go through a peer-review process. Articles usually report original scholarly research. Most illustrations are charts, figures, or graphs.