Columbia subject headings:
Christianity and other religions--Islam--Congresses.
Christianity and other religions--Middle East--Congresses.
Christians--Middle East--History--Congresses.
East and West--Congresses.
Eastern churches--Middle East--History--Congresses.
Islam--Relations--Syrian Church--Congresses.
Middle East--Church history--Congresses.
Syriac Christians--Congresses.
Syrian churches--History--Congresses.
Harvard subject headings:
Christianity and other religions--Islam
Eastern churches--Europe--History.
Islam--Relations--Christianity
Middle East--Church history.
Missions--Middle East--History.
Oriental Orthodox churches--Europe--History.
Princeton subject headings:
Christianity and other religions--Islam.
Eastern churches--Europe--History.
Islam--Relations--Christianity.
Middle East--Church history.
Missions--Middle East--History.
Oriental Orthodox churches--Europe--History.