Columbia subject headings:
Peace-building--Legal status, laws, etc.
Peace-building.
Peacekeeping forces.
United Nations--History--20th century.
United Nations--History--21st century.
Harvard subject headings:
Peace-building
Peace-building--Legal status, laws, etc.
Peacekeeping forces.
United Nations--History--20th century.
United Nations--History--21st century.
Princeton subject headings:
Peace-building--Legal status, laws, etc..
Peace-building.
Peacekeeping forces.
United Nations--History--20th century.
United Nations--History--21st century.