MLA Handbook by 
A Pocket Style Manual by 
Rules for Writers by Many online periodical indexes show you exactly how to cite the sources you find. Look for a link that says something like "citation tools," or "cite this article." Click on that link, and you will see the citation in various formats. Note: you are ultimately responsible for making sure your citations are correct. Make sure that your indentations and spacing are correct.
This MLA web resource contains specific information on formatting a research paper and creating a Works Cited page.
