Columbia subject headings:
Harvard subject headings:
Albigenses--Sources.
Christian heresies--History--Middle Ages, 600-1500--Sources.
Church history--Middle Ages, 600-1500--Sources.
Theology--Early works to 1800
Princeton subject headings:
Albigenses--Sources.
Christian heresies--History--Middle Ages, 600-1500--Sources.
Church history--Middle Ages, 600-1500--Sources.
Theology--Early works to 1800.