Παραπομπή σε μορφή APA (7η εκδ.)

OECD International Conference on the Economic, Social and Environmental Problems of Cities. (1994). Cities for the 21st century. Organisation for Economic Co-opearation and Development.

Παραπομπή σε μορφή Chicago (17η εκδ.)

OECD International Conference on the Economic, Social and Environmental Problems of Cities. Cities for the 21st Century. Paris: Organisation for Economic Co-opearation and Development, 1994.

Παραπομπή σε μορφή MLA (9th εκδ.)

OECD International Conference on the Economic, Social and Environmental Problems of Cities. Cities for the 21st Century. Organisation for Economic Co-opearation and Development, 1994.