Cite an unpublished translation by following the MLA template of core elements. List the author of the work, the title of the translation in quotation marks (since it is an unpublished work), and the name of the translator. In the optional-element slot at the end of the entry, indicate the format:
Wallace, David Foster. “Ludus infinitus.” Translated by Publius Vergilius Maro. Typescript.
When you refer to the translation in your prose, indicate the original title:
In what follows, I provide a thorough analysis of “Ludus infinitus,” the Latin translation of David Foster Wallace’s Infinite Jest.
Published 12 March 2018