If you just want one formatted citation for an article or book in a common citation format (MLA, ALA, Chicago/Turabian or Harvard), you can generate one in LibrarySearch by using the "Cite This Item" link.
If you instead want a tool that will allow you to organize your references as well as generate citations, we recommend Zotero. Our Citation Management Tools guide provides information about Zotero and other tools including how to get started, and contact information for librarians who can give one-on-one help.