With the exception of May, June and July, the names of the months must be abbreviated in MLA works cited lists as follows:
Jane Austen Society of Australia. "Sense & Sensibility." Jane Austen Society of North America. Map. www.jasna.org/info/images/map-ss-1200.jpg.
When the source you are citing has no publication date, simply omit that part of the citation. Do not write "No date" or "N.d.".