1. Mitsilegas, V. 2009.EU criminal law, 5–9, 63. Oxford: Hart Publishing.
2. Nordic Cooperation in Criminal Policy and Crime Prevention
3. Joubert, C and Bevers, H. 1996.Schengen investigated: a comparative interpretation of the Schengen provisions on international police cooperation in the light of the European Convention on Human Rights, 130–134. The Hague: Kluwer Law International.