Columbia subject headings:
Christian heresies--History--Middle Ages, 600-1500.
Christian sects, Medieval.
Dissenters, Religious--Europe--History.
Harvard subject headings:
Christian heresies--History--Middle Ages, 600-1500
Christian sects, Medieval
Dissenters, Religious--Europe--History.
Princeton subject headings:
Christian heresies--History--Middle Ages, 600-1500.
Christian sects, Medieval.
Dissenters, Religious--Europe--History.