What+does+n.p+and+n.d.+mean?

What does n.p and n.d. mean? In some styles, notably MLA 7th edition and APA, you may see the acronyms "n.p." or "n.d." in your citation. Some teachers prefer you exclude these acronyms. If you would like to remove these, just click "No" in the publication placeholder option visible at the bottom of your citation list.
 * N.p. stands for "No place" or "no publisher", and shows up when no publication city or publisher has been given for that medium of publication.
 * N.d. stands for "No date" and shows up when no publication date has been provided for that medium of publication.