For the most authoritative information on MLA Style, consult the MLA Handbook, 9th Edition. Copies are readily available at the library reference desks and available for check out LB2369 .M52 2021
The 9th edition of the MLA Handbook has some changes from the previous edition.
Some of the changes include
Here's a chart from MLA outlining the updates and changes.
For excellent examples of just about anything to do with MLA, try the OWL@Purdue site.
Lansing Community College website is another good source for learning how to format references from print and online sources as well as in-text citations.