Columbia subject headings:
Christianity and other religions--Islam--History.
Islam--Africa, North--History.
Islam--Relations--Christianity--History.
Islam--Spain--History.
Islamic heresies--Africa, North.
Islamic heresies--Spain.
Islamic sects--Africa, North.
Islamic sects--Spain.
Sufism--Africa, North--History.
Sufism--Spain--History.
Harvard subject headings:
Dialogue--Religious aspects--Islam
Islamic sects--Africa, North.
Islamic sects--Spain.
Princeton subject headings:
Christianity and other religions--Islam--History.
Islam--Africa, North--History.
Islam--Relations--Christianity--History.
Islam--Spain--History.
Islamic heresies--Africa, North.
Islamic heresies--Spain.
Islamic sects--Africa, North.
Islamic sects--Spain.
Sufism--Africa, North--History.
Sufism--Spain--History.