Cite by short name (LibreOffice's own), numbered, APA, MLA or Chicago:
the style sets the citation's label and the row's shape, and rides the
bibliography index node — ODF as the entry template LibreOffice
regenerates its rows from (verified through a re-save), Word as the
sources part's StyleName. Labels are derived and kept true by an
appendTransaction, so adding a citation renumbers the rest.