The monthly editions contain citations published only in the last month. Many paper indexes are also available online. Others are available only online. These databases come in two major forms. Bibliographic and full-text.
Bibliographic databases contain only citations to items.
Some bibliographic databases may also provide abstracts , brief summaries, for articles. Reading these abstracts may help you decide if the article is relevant to your research need, before you try to locate the original article. Abstracts may be written by the database producer or by the article's author. Check the About section of the database for clarification. Full-text databases contain both bibliographic citations and the actual content of an article.