Παραπομπή σε μορφή APA (7η εκδ.)

European Commission. (1999). Blue book on geothermal resources: A strategic plan for the development of the European Geothermal Sector. Office for Official Publications of the European Communities.

Παραπομπή σε μορφή Chicago (17η εκδ.)

European Commission. Blue Book on Geothermal Resources: A Strategic Plan for the Development of the European Geothermal Sector. Luxembourg: Office for Official Publications of the European Communities, 1999.

Παραπομπή σε μορφή MLA (8th εκδ.)

European Commission. Blue Book on Geothermal Resources: A Strategic Plan for the Development of the European Geothermal Sector. Office for Official Publications of the European Communities, 1999.