Columbia subject headings:
Portugal--History--Revolution, 1974.
Portugal--Politics and government--1974-
Socialism--Portugal--History--20th century.
Harvard subject headings:
Portugal--History--Revolution, 1974.
Portugal--Politics and government--1974-
Socialism--Portugal--20th century.
Socialism--Portugal--History--20th century.
Princeton subject headings:
Portugal--History--Revolution, 1974.
Portugal--Politics and government--1974-
Socialism--Portugal--History--20th century.