European Consultative Forum on the Environment and Sustainable Development., & Sustainability 21 Conference. (2000). Sustainability 21 Conference: Helsinki, 5 and 6 November 1999. Luxembourg: Office for Official Publicationsof the European Communities.
Παραπομπή Chicago StyleEuropean Consultative Forum on the Environment and Sustainable Development., and Sustainability 21 Conference. Sustainability 21 Conference: Helsinki, 5 and 6 November 1999. Luxembourg: Office for Official Publicationsof the European Communities, 2000.
Παραπομπή MLAEuropean Consultative Forum on the Environment and Sustainable Development., and Sustainability 21 Conference. Sustainability 21 Conference: Helsinki, 5 and 6 November 1999. Luxembourg: Office for Official Publicationsof the European Communities, 2000.