MLA: What does n.d., n.p. or n.pag. mean in my citation?

Abbreviations in citations (capitalize after a period, do not capitalize after a colon, semicolon, or comma):

N.p or n.p. ("no publisher") means that the publisher's name is missing
N.p or n.p. ("no place") means the city of publication is missing
N.d. or n.d. ("no date) means that the publication date is missing
N. pag. or n. pag. ("no pagination") means that the book's pages are unnumbered