NoodleTools is a great one-stop shop for citations, notecards, annotated bibliographies, and more. Set up an account with your school Google credentials (we subscribe to NoodleTools) and you can save your partially completed research/citation work. If you just have one or two citations to create and don't want to bother with logging in, click on the NoodleTools icon at left to reach NoodleTools Express. Again, it can cite APA or Chicago, but the link defaults to MLA.
Students click here to set up your account.
Teachers click here to set up your account.