Evropská komise. Environment Directorate-General. Sustainability 21 Conference, Helsinki, 5 and 6 November 1999. Luxembourg: Office for Official Publications of the European Communities, 2000. 15 s.
(2000). Sustainability 21 Conference, Helsinki, 5 and 6 November 1999. Luxembourg: Office for Official Publications of the European Communities.
Styl ChicagoSustainability 21 Conference, Helsinki, 5 and 6 November 1999. Luxembourg: Office for Official Publications of the European Communities, 2000.
Citace podle MLASustainability 21 Conference, Helsinki, 5 and 6 November 1999. Luxembourg: Office for Official Publications of the European Communities, 2000.
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