It is a good idea to become familiar with the scholarly journals in your field. Authors often mention sources, but rarely formally cite them in bibliographies. Individual issues contain numerous advertisements. There is no peer review process. Articles are meant to inform and entertain.
Illustrations are numerous and colorful.
Authors cite their sources in endnotes, footnotes or bibliographies. Individual issues have little or no advertising. Articles must go through a peer-review process. Illustrations usually take the form of charts and graphs. Articles use jargon of the discipline.