Columbia subject headings:
Cults--History--20th century--Congresses.
Sects--History--20th century--Congresses.
Harvard subject headings:
Cults--History--20th century--Congresses.
Sects--History--20th century--Congresses.
Princeton subject headings:
Cults--History--20th century--Congresses.
Sects--History--20th century--Congresses.