Παραπομπή APA
Commission of the European Communities. (1999). Blue book on geothermal resources: A strategic plan for the development of European geothermal sector. Luxembourg: Office for Official Publications of the European Communities.
Παραπομπή Chicago StyleCommission of the European Communities. Blue Book On Geothermal Resources: A Strategic Plan for the Development of European Geothermal Sector. Luxembourg: Office for Official Publications of the European Communities, 1999.
Παραπομπή MLACommission of the European Communities. Blue Book On Geothermal Resources: A Strategic Plan for the Development of European Geothermal Sector. Luxembourg: Office for Official Publications of the European Communities, 1999.
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