Παραπομπή σε μορφή APA (7η εκδ.)

Commission of the European Communities. (1990). Green paper on the urban environment. Commission of the European communities.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Commission of the European Communities. Green Paper on the Urban Environment. Brussels: Commission of the European communities, 1990.

Παραπομπή σε μορφή MLA (9th εκδ.)

Commission of the European Communities. Green Paper on the Urban Environment. Commission of the European communities, 1990.