(1999). Environment in the European Union at the turn of the century. Denmark: European Environment agency.
Παραπομπή Chicago StyleEnvironment in the European Union At the Turn of the Century. Denmark: European Environment agency, 1999.
Παραπομπή MLAEnvironment in the European Union At the Turn of the Century. Denmark: European Environment agency, 1999.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.