Citation generators include BibMe and CiteThisForMe. BibMe allows the user to select a style, search for book, article or website, or enter the relevant information, add the source to the bibliography and build citations from it.
The site produces a bibliography in the selected format that the user may download. The site is easy to use but the user must upgrade to a paid account to save the bibliography. It is located at BibMe.org.
Cite This For Me allows the user to click a button and cite a website by travelling to the site, clicking the button and generating a correctly formatted citation that can be cut and pasted into an existing document or saved on the site for later use. The site also offers a Google Chrome and Word extensions and is located at CiteThisForMe.com.