To cite conference proceedings, follow the MLA format template. The example below lists the editors (as “Author”), the title, the publisher, and the date of publication:

Chang, Steve S., et al., editors. Proceedings of the Twenty-Fifth Annual Meeting of the Berkeley Linguistics Society, February 12-15, 1999: General Session and Parasession on Loan Word Phenomena. Berkeley Linguistics Society, 2000.  

If you are citing a section of the proceedings, cite the section the same way you would an essay in a collection: first list the author and title of the essay and then continue the entry with the title of the collected proceedings (now, in the “Title of container” slot):

Hualde, José Ignacio. “Patterns of Correspondence in the Adaptation of Spanish Borrowings in Basque.” Proceedings of the Twenty-Fifth Annual Meeting of the Berkeley Linguistics Society, February 12-15, 1999: General Session and Parasession on Loan Word Phenomena, edited by Steven S. Chang et al., Berkeley Linguistics Society, 2000, pp. 348-58.