The European Eco-School/International Agenda 21 School - Best practice approaches
aus: The Europen Eco-School/International Agenda 21 School. Best practice approaches. LI Hamburg, September 2011
Artikel als pdf-Dokument 
aus: The Europen Eco-School/International Agenda 21 School. Best practice approaches. LI Hamburg, September 2011
Artikel als pdf-Dokument