The online writing lab at Purdue has an excellent explanation of the general MLA guidelines as well as many examples on how to cite your sources in-text and on the works cited list.
Citation generator websites
Here are some free resources to generate single reference entries. Just like with generating a citation through the library tools, you must double-check any generated citations for accuracy. To better keep track of your references and more easily generate citations and entire bibliographies, try using a citation manager tool like Mendeley or Zotero.
From the creators of the Zotero citation manager. Generates citations from URL, ISBN, DOI, PMID, arXiv ID, title, or manual entry. Output in all common styles (APA 6, MLA 7, MLA 8, Chicago, Turabian) and thousands more. Unlike most citation generators, this tool can be used to create a list of multiple citations.