European Commission., & Metropolis 2000: Energy and Sustainability in European Cities. (1999). Metropolis 2000: Energy and sustainability in European cities : congress proceedings : January 17-19, 1999, Athens, Greece. Luxembourg: Office for Official Publications of the European Communities.
Παραπομπή Chicago StyleEuropean Commission., and Metropolis 2000: Energy and Sustainability in European Cities. Metropolis 2000: Energy and Sustainability in European Cities : Congress Proceedings : January 17-19, 1999, Athens, Greece. Luxembourg: Office for Official Publications of the European Communities, 1999.
Παραπομπή MLAEuropean Commission., and Metropolis 2000: Energy and Sustainability in European Cities. Metropolis 2000: Energy and Sustainability in European Cities : Congress Proceedings : January 17-19, 1999, Athens, Greece. Luxembourg: Office for Official Publications of the European Communities, 1999.