For sources found on the Internet, use the publication date or last revised date for all documents. lf using a copyright date, ensure that the date applies to the content you are citing. If there is no copyright date, use the abbreviation (n.d.) meaning "no date."
For sources found in print format, use the most recent copyright date, which appears after the © symbol. If there is no publication date, use the abbreviation (n.d.) meaning "no date."
If a source goes out of print and then is published again, it is considered republished. When working with a republished source, make sure to indicate the year the original work was published at the end of the reference in brackets. See below for an example of a republished source in an anthology.