Q. How do I cite a prose play MLA style?

For prose plays, the MLA Handbook says:

"In a reference to a commonly studied prose work, such as a novel or play, that is available in several editions, it is helpful to provide more information than just a page number from the edition used... In such a reference, give the page number first, add a semicolon, and then give other identifying information, using appropriate abbreviations."

Example:

In A Vindication of the Rights of Woman, Mary Wollstonecraft recollects many "women who, not led by degrees to proper studies, and not permitted to choose for themselves, have indeed been overgrown children" (185; ch. 13, sec. 2).