If you're unable to contact the University Writing Lab, or if you just want a quick reference, Purdue University provides an Online Writing resource that you can use to double check your MLA citations to make sure that they're correct.
UWC
The University Writing Center is the premier source on campus to aid you in your writing and citations, both for your classes and for recreational writing! the UWC offers in person and online consultations. They are available for online consultations.
