Columbia subject headings:
Caliphate--History.
Caliphate.
Islam and state.
Islamic Empire--Politics and government.
Islamic fundamentalism--Political aspects.
Political science--Islamic Empire--History.
Harvard subject headings:
Caliphate
Caliphate--History
Islam and state.
Islamic Empire--Politics and government.
Islamic fundamentalism--Political aspects.
Political science--Islamic Empire--History
Princeton subject headings:
Caliphate--History.
Caliphate.
Islam and state.
Islamic Empire--Politics and government.
Islamic fundamentalism--Political aspects.
Political science--Islamic Empire--History.