The defining characteristics of an information source, like books, articles, videos, and government documents. For a book, the minimum is; author, title, city of publication, publisher, and date of publication. For an article, the basic information is: author of article, title of publication, volume/issue, date, page number. Information about the source should be arranged consistently, following an established style found in Style Manuals. A database that contains records for items that a library owns, such as books, videos, reserve materials, reference books, and government documents. The catalog is searchable by a variety of fields, including keyword, author, title and Library of Congress Subject Heading. Online Library catalogs usually include a "Your Record" feature that allow users to log in and see what they have checked out, renew their materials, etc.