Columbia subject headings:
Harvard subject headings:
Arab countries--Politics and government--21st century.
Democratization--Arab countries--History--21st century.
Protest movements--Arab countries--History--21st century.
Revolutions--Arab countries--History--21st century.
Princeton subject headings:
Arab countries--Politics and government--21st century.
Protest movements--Arab countries--History--21st century.
Revolutions--Arab countries--History--21st century.