Παραπομπή σε μορφή APA (7η εκδ.)

European Commission. (1999). European Union energy outlook to 2020. Office for Official Publications of the European Communities.

Παραπομπή σε μορφή Chicago (17η εκδ.)

European Commission. European Union Energy Outlook to 2020. Luxembourg: Office for Official Publications of the European Communities, 1999.

Παραπομπή σε μορφή MLA (8th εκδ.)

European Commission. European Union Energy Outlook to 2020. Office for Official Publications of the European Communities, 1999.