Columbia subject headings:
Peace-building--Political aspects--20th century.
Peacekeeping forces--Political aspects--20th century.
United Nations--Peacekeeping forces.
Harvard subject headings:
United Nations--Armed Forces.
United Nations--Peacekeeping forces.
Princeton subject headings:
Peace-building--Political aspects--20th century.
Peacekeeping forces--Political aspects--20th century.
United Nations--Peacekeeping forces.