Columbia subject headings:
Harvard subject headings:
Caliphate
IS (Organization)
Islamic fundamentalism--Middle East.
Middle East--History--21st century.
Terrorism--Middle East
Terrorism--Religious aspects--Islam
Princeton subject headings:
Caliphate.
IS (Organization)
Islamic fundamentalism--Middle East.
Middle East--History--21st century.
Terrorism--Middle East.
Terrorism--Religious aspects--Islam.