Columbia subject headings:
Bliss Bibliographic classification--Bibliography.
Classification--Bibliography.
Subject headings--Bibliography.
Thesauri--Bibliography.
United Nations--Bibliography.
Harvard subject headings:
Classification--Books--Bibliography.
International agencies--Bibliography.
United Nations--Bibliography.
United Nations--Information services.
Princeton subject headings:
Bliss Bibliographic classification--Bibliography.
Classification--Bibliography.
Subject headings--Bibliography.
Thesauri--Bibliography.
United Nations--Bibliography.