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Periodical articles are published in scholarly journals, popular magazines, and trade publications.  While all three types of publications may contain articles on a given topic, the language, authority, and intended audience is distinct, one from the other.  Below are general characteristics you may use to differentiate among the types of articles.
  Scholarly Journal Articles Popular Magazine Articles
Always include bibliography/reference list Do not include bibliography/reference list
Authors are identified as experts in field Authors are often on staff of publication
Language is technical Language is non-technical
Report original research or experimentation Inform or entertain the general public
Articles in periodicals are identified by searching by subject in one of the many periodical indexes provided by the Library. These indexes, housed in the Reference Room or on the Library Home Page, may cover one subject area (e.g., BIOSIS Previews) or numerous subject areas (e.g., Academic Search Elite).