In order to organize and manage your citations, consider using a Citation Manager like Zotero. More information on Zotero and other citation managers can be found on the Citation Managers Guide.
MLA style is a popular citation style for English language and literature, but it is not the only one. Some professors (or publishers, if you are writing an article to be published) may prefer a different style, such as Chicago style or APA style, so always check before you format and submit your work.