In MLA format, when a work has multiple authors, you typically list them in the order they are mentioned, while using the appropriate punctuation. Since this hypothetical book was supposedly written by four authors, you would format the names as follows:
Shelley, Mary, Twain, Mark, Dickinson, Emily, and Orwell, George. Frankenstein. Publisher, Year of Publication.
Make sure to replace "Publisher" and "Year of Publication" with the actual publisher's name and the year of publication for the hypothetical book. If you want to focus solely on the narrative style of the cited authors and their contributions, you can also choose to emphasize the idea of collaboration depending on your analysis or purpose.