Lastname, First name. "Title of Essay." Title of Collection. Ed. Editor's Name(s). Place of Publication: Publisher, Year. Page range of entry. Medium of Publication.
So, in your scenario, I believe the Works Cited entry should look something like this:
Shakespeare, William. "A Midsummer Night's Dream." A Midsummer Night's Dream: Texts and Contexts. Ed. Gail Kern Paster and Skiles Howard. New York: Bedford/St. Martin's, 1999. 1-86.