Columbia subject headings:
Catholic Church--History--Sources.
Council of Constantinople (3rd : 680-681 : Constantinople)--Sources.
Councils and synods, Ecumenical--Sources.
Harvard subject headings:
Catholic Church--History--Sources.
Church history--Middle Ages, 600-1500--Sources.
Council of Constantinople (3rd : 680-681 : Constantinople)
Councils and synods, Ecumenical--History--Sources.
Councils and synods, Ecumenical--Sources.
Princeton subject headings: