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