Columbia subject headings:
Competition, Unfair--European Union countries.
Government purchasing--European Union countries.
Government purchasing--Law and legislation--European Union countries.
Harvard subject headings:
Competition, Unfair--European Union countries
Government purchasing--European Union countries.
Government purchasing--Law and legislation--European Union countries.
Princeton subject headings:
Competition, Unfair--European Union countries.
Government purchasing--European Union countries.
Government purchasing--Law and legislation--European Union countries.