Παραπομπή σε μορφή APA (7η εκδ.)

European Commission. (2011). Cities of tomorrow: Challenges, visions, ways forward. Publications Office of the European Union.

Παραπομπή σε μορφή Chicago (17η εκδ.)

European Commission. Cities of Tomorrow: Challenges, Visions, Ways Forward. Luxembourg: Publications Office of the European Union, 2011.

Παραπομπή σε μορφή MLA (8th εκδ.)

European Commission. Cities of Tomorrow: Challenges, Visions, Ways Forward. Publications Office of the European Union, 2011.