There is a unique number for each published book. ISSN the acronym for International Standard Serial Number. There is a unique number assigned to each serial and periodical. Online Database an electronic database of either full-text documents or citations and abstracts which can be searched by telephone or internet connection. Periodical a magazine, journal, newsletter, or newspaper produced on a regular or periodic basis.
Libraries often arrange periodicals in a separate location from books and other types of materials.
Popular Source generally refers to information, especially articles, written to entertain or inform the general public. Examples of popular magazines include Time, Newsweek , and Life . In libraries, it includes data such as author, title, date, publisher, subject headings. Reference Section a separate location for the most-frequently used general encyclopedias, handbooks, guides, directories, etc. These items do not circulate so that they will always be available for use in the library.