Remember that your citations are a map back to the source you used.
For all sources, you will need:
In addition, depending on the type of source, you may need the publishing place (book), volume (journal), section (newspaper), or date of access (web resource).
Just keep in mind ... what would YOU need if you wanted to find the article, book, or web page again?
MLA is pretty easy to format if you can remember a few rules: