Editing Serial comma (section)

===Mainly British style guides supporting mandatory or typical use===
;''[[MHRA Style Guide]]'' ([[Modern Humanities Research Association]]), 3rd edition (2013)<ref name=mhra>{{Cite book |title=MHRA Style Guide: a handbook for authors, editors, and writers of theses |edition=3rd |year=2013 |place=London |publisher=Modern Humanities Research Association |pages=33–4 |isbn=978-1-78188-009-8 |url=http://www.mhra.org.uk/Publications/Books/StyleGuide/index.html |access-date=April 19, 2013 |archive-date=November 5, 2018 |archive-url=https://web.archive.org/web/20181105003016/http://www.mhra.org.uk/Publications/Books/StyleGuide/index.html |url-status=dead }}</ref>
:"In an enumeration of three or more items, the practice in MHRA journals is to insert commas after all but the last item, to give equal weight to each enumerated element. … The conjunctions ''and'' and ''or'' without a preceding comma are understood as linking the parts of a single enumerated element"
:But paragraph 5.1<ref name=mhra/> says "The comma after the penultimate item may be omitted in books published by the MHRA, as long as the sense is clear."