Columbia subject headings:
Islam--Doctrines--Study and teaching--Germany--Congresses.
Islam--Study and teaching--Germany--Congresses.
Harvard subject headings:
Islam--Doctrines--Congresses.
Islam--Study and teaching--Congresses.
Islam--Study and teaching--Germany--Congresses.
Princeton subject headings:
Islam--Doctrines--Study and teaching--Germany--Congresses.
Islam--Study and teaching--Germany--Congresses.