These websites have forms where you can fill in the needed information and get a formatted citation to cut and paste into your documents.
EasyBib
EasyBib allows the user to select the type of citation needed, enter key information into the provided fields, and it does the rest!
Bibme
BibMe is a free automatic citation creator that supports MLA, APA, Chicago, and Turabian formatting. This bibliography maker auto-fills and is very easy to use. And it's free!
Son of Citation Machine
The Citation Machine will do APA, MLA, Chicago, and Turabian style citations for the most common types of sources: books, book chapters, articles, webpages, images, videos, etc. Both in-text (parenthetical) references and the full citation for the bibliography are produced and ready for copying and pasting into your document.
NoodleBib Express
Free citation formatting from the makers of NoodleTools. NoodleBib Express does MLA, APA, and Chicago, and has options for dozens of types of sources, from books and articles to patents, letters, and TV programs.
WriteCite
WriteCite does APA, Harvard, and MLA citations and covers a wide variety of types of sources, from corporate advertising to musical scores, as well as the usual books and articles. There is also an account version.