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