1. VI.2. Convention Implementing the Schengen Agreement of 14 June 1985 between the Governments of the States of the Benelux Union, the Federal Republic of Germany and the French Republic on the Gradual Abolition of Checks at Their Common Borders
2. Schengen Governance After the Lisbon Treaty;Francesca Ferraro;Library Briefing. (Library of the European Parliament,2013
3. Cross-Border Perspectives on Police and Judicial Cooperation in the European Union;Bogdan;Eurolimes. Institute for Euroregional Studies
4. Schengen Thirty Years On: Results, Realities, Challenges;Philippe Delivet;European Issues. Fondation Robert Schuman: The Research and Studies Centre on Europe,2015