Helpful websites for MLA formatting:
https://owl.english.purdue.edu/owl/resource/747/22/ Super good info
https://owl.english.purdue.edu/media/pdf/20160920114529_747.pdf Sample Document
Keep in mind that if you use the Gale databases for your sources, the citations are already done for you. All you have to do is highlight, copy, and paste.
Also, if you create your document in Google Drive and click on Tools at the top and then Explore, you can use the sources that pop up along the right hand side of your screen and it will create the citation for you at the bottom of your document. Cool!