They are found in magazines, journals, and newspapers. Magazine articles are useful for brief, general, introductory information.
Newspaper articles are another good sources for current, general information.
Journal articles from scholarly or professional journals provide more scholarly or technical information. These articles are usually written by scholars in a particular field. To easiest way to find periodical articles is to use a periodical index. The easiest are the electronic periodical indexes listed below. Determine if the fulltext of the article is available.