Columbia subject headings:
IS (Organization)
Islamic fundamentalism--Political aspects--21st century.
Terrorism--Middle East.
Terrorism--Religious aspects--Islam.
Harvard subject headings:
IS (Organization)
Islam and politics
Islam and state.
Religious militants--Iraq.
Religious militants--Syria.
Princeton subject headings:
IS (Organization)
Islamic fundamentalism--Political aspects--21st century.
Terrorism--Middle East.
Terrorism--Religious aspects--Islam.