Source and copyright
Source: European Commission. Communication from the Commission to the European Parliament, the Council, the European Economic and Social Committee and the Committee of the Regions. Schengen governance – strengthening the area without internal border control, COM (2011) 561 final. Brussels: 16.09.2011. 11 p. http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=COM:2011:0561:FIN:EN:PDF.
Copyright: European Union