Citation Management Tools can help you in keeping track of your sources, citing sources within your text, and creating a bibliography. When using citation tools, you must check the citations with a relevant Style Guide because they do make mistakes, such as not formatting correctly or exporting the information incorrectly.
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, so always check before you format and submit your work.
MLA Handbook by 
The Chicago Manual of Style, 17th Edition by