EasyBib is a website that generates citations. It is staffed by Librarians and its citations are usually very accurate. It only does the MLA style for free - and has annoying ads - but it does a good job citing your sources.
I bit the bullet and signed up for a one year membership so the version we are looking at in this tutorial is free of ads.
As you can see, it includes the MLA, APA and Chicago styles.
Click the More drop-down arrow for more Styles. What is the first Style listed?