Most citations will includeauthor(s), publication date and title(s), with additional information (like volume, issue and page numbers) added, depending on the type of source. Different source types will be cited in slightly different ways (see some examples here).
Citations are formatted in very uniform ways (varying by academic discipline), to make it easy for researchers to find the information they need at a glance. The formatting rules are found in style guides. You can find style guides on the library's website, under the RESOURCES menu.