Ikonomou, Constantinos. ‘An Assessment of European Integration for the EU-15 (1971-2015)’. Περιφέρεια | Regional Integration: Politics, Economics, Governance, no. 10 (Δεκέμβριος 7, 2020): 43–69. ημερομηνία πρόσβασης Απρίλιος 16, 2025. https://ejournals.epublishing.ekt.gr/index.php/periphery/article/view/25480.