Columbia subject headings:
Christianity and other religions--Islam.
Islam--Relations--Christianity.
Nigeria, Northern--Religion.
Tanzania--Religion.
Harvard subject headings:
Christianity and other religions--Islam
Islam--Relations--Christianity
Nigeria, Northern--Religion.
Tanzania--Religion.
Princeton subject headings:
Christianity and other religions--Islam.
Islam--Relations--Christianity.
Nigeria, Northern--Ethnic relations.
Nigeria, Northern--Religion.
Tanzania--Ethnic relations.
Tanzania--Religion.