Columbia subject headings:
Harvard subject headings:
Caliphate--History
Islamic Empire--Politics and government.
Political science--Islamic Empire--History
ʻAshmāwī, Muḥammad Saʻīd. Khilāfah al-Islāmīyah.
Princeton subject headings:
Caliphate--History.
Islamic Empire--Politics and government.
ʻAshmāwī, Muḥammad Saʻīd. Khilāfah al-Islāmīyah.