(1997). Agenda 21 the first five years: : European Community progress on the implementation of Agenda 21: 1992-97. Luxembourg: Office for Official Publications of the European Communities.
Παραπομπή Chicago StyleAgenda 21 the First Five Years: : European Community Progress On the Implementation of Agenda 21: 1992-97. Luxembourg: Office for Official Publications of the European Communities, 1997.
Παραπομπή MLAAgenda 21 the First Five Years: : European Community Progress On the Implementation of Agenda 21: 1992-97. Luxembourg: Office for Official Publications of the European Communities, 1997.
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