MediaWiki Extension: Cite
www.mediawiki.org/wiki/Extension:Cite/Cite.php
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
Cite.php is a Cite extension that adds two parser hooks to MediaWiki, <ref> and <references />; these operate together to add citations to pages.