As noted on page 42 of the MLA Handbook, if the book is published by its author or editor, omit the publisher’s name from the works-cited-list entry:
Hocking, Amanda. Fate. 2010.
If the publisher is unknown—as in the example below—follow the guidelines on page 20 of the handbook: “An element should be omitted from the entry if it’s not relevant to the work being documented.”
Cummings, E. E. The Enormous Room. 2017.
Keep in mind, though, that a source whose publisher is unknown may not be reliable. Established publishers generally ensure that the texts they publish are accurate versions of the author’s work. A source from an unknown publisher could be missing text or contain inaccurate text, so if a version of the source is available from an established publisher, consider using that version instead.
Published 9 March 2017