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