Columbia subject headings:
Harvard subject headings:
Christianity and other religions--Islam
Christianity and other religions--Judaism
Church history--Middle Ages, 600-1500
Islam--Relations--Christianity
Islam--Relations--Judaism
Judaism--Relations--Christianity
Judaism--Relations--Islam
Monotheism--History
Princeton subject headings:
Christianity and other religions.
Islam--Relations--Christianity.
Islam--Relations--Judaism.
Judaism--Relations--Christianity.
Judaism--Relations--Islam.
Monotheism--History.