Παραπομπή σε μορφή APA (7η εκδ.)

European Commission. (1999). EU focus on clean air. Office for Official Publications of the European Communities.

Παραπομπή σε μορφή Chicago (17η εκδ.)

European Commission. EU Focus on Clean Air. Luxembourg: Office for Official Publications of the European Communities, 1999.

Παραπομπή σε μορφή MLA (8th εκδ.)

European Commission. EU Focus on Clean Air. Office for Official Publications of the European Communities, 1999.