E. Szafarz, "The Legal Framework for Political Cooperation in Europe" in The Changing Political Structure of Europe: Aspects of International Law, Martinus Nijhoff Publishers. ISBN 0-7923-1379-8. p.221Arxivləşdirilib 2016-01-25 at the Wayback Machine.
E. Szafarz, "The Legal Framework for Political Cooperation in Europe" in The Changing Political Structure of Europe: Aspects of International Law, Martinus Nijhoff Publishers. ISBN 0-7923-1379-8. p.221Arxivləşdirilib 2016-01-25 at the Wayback Machine.