Many of your professors expect you to produce your papers in MLA format. Produced by the Modern Language Association, this format and style guide is now in its 8th edition. The newest version has radically altered some of its rules regarding format, especially in terms of citations and Works Cited pages. This guide will help explain some of the differences between MLA 7 and MLA 8, and provide resources so you can use the new version.
Please remember that keeping up with writing and style guides is generally the work of academics and librarians. Many professors are creatures of habit, and most are very busy, so your professor may not have noticed this shift to MLA 8 or simply may not like the new system. With that in mind, you should consider checking in with your professor to make sure they want you to use MLA 8 as opposed to the traditional (now defunct) MLA.