Different types of publications have different purposes and different audiences. Scholarly Journals Authors are authorities in their fields. Authors cite their sources in endnotes, footnotes, or bibliographies. Individual issues have little or no advertising. Articles must go through a peer-review or refeered process.
Articles are usually reports on scholarly research.
Illustrations usually take the form of charts and graphs. Articles use jargon of the discipline. Trade Publications Authors are specialists in a certain field or industry. Authors often mention sources, but rarely formally cite them in bibliographies. Intended audience includes people in the industry or people seeking employment in the industry.