Columbia subject headings:
Christian heresies--History--Middle Ages, 600-1500.
Sects, Medieval.
Harvard subject headings:
Authority--History--Sources.
Christian heresies--History--Middle Ages, 600-1500
Christian heresies--History--Middle Ages, 600-1500--Sources.
Sects, Medieval--History--Sources.
Sects, Medieval.
Princeton subject headings:
Christian heresies--History--Middle Ages, 600-1500.
Sects, Medieval.