This is the new official guide to MLA style. The library has several copies in its Reference section on the 1st Floor that you can use inside the library, and has other copies on the 3rd Floor that you can check-out.
The MLA 8th Edition handbook, released in April 2016, includes major changes to the citation process. This page highlights a few of the differences between MLA 7 and MLA 8.
MLA Handbook (8th Edition) by