Kellermann KELLERMANN (ed), Jaap DE ZWANN (ed), EU Enlargement: the Constitutional Impact at EU and National Level, Hague, T.M.C. Asser Press, 2001, 65-79
DE WITTE, Bruno, Constitutional Aspects of European Union Membership in the Six Member States: Model Solutions for the Applicant Countries?, in Kellermann KELLERMANN (ed), Jaap DE ZWANN (ed), EU Enlargement: the Constitutional Impact at EU and National Level, Hague, T.M.C. Asser Press, 2001, 65-79
- https://hdl.handle.net/1814/4078