Sometimes there are different versions of a source. For example, books are often revised and published in editions. If the source you are citing notes an edition or some other version, that information should be included in the citation.
Example citations
Clements, Jonathan. The Anime Encyclopedia: A Century of Japanese Animation. 3rd revised ed., Stone Bridge Press, 2015.
MLA Handbook. 9th ed., The Modern Language Association of America, 2021.
Jackson, Peter, director. The Lord of the Rings: Fellowship of the Ring. Extended ed., Newline Cinema, 19 Dec. 2001.