It is not an online journal article, newsletter, government document, or book. It has a URL by which it can be can be freely and directly accessed. It was not retrieved from a proprietary database. It is not a plain-old Web page. The article itself usually does not have a URL by which it can be directly accessed.
Proprietary database is the term used to refer to online journal and document indexes.
These commercial, subscription, or non-profit services typically provide indexing, abstracts, and text for journal articles. Name of author, editor, compiler, or translator of the text. Last name, First name. Followed by an abbreviation, such as ed . For editor, ed .