Klerks, P. (1993). The state of Europe: A digest of European police systems, prison conditions, private security, human rights and civil liberties and the internal security situation in the 1990s. Domestic Security Research Foundation.
Cita Chicago Style (17a ed.)Klerks, Peter. The State of Europe: A Digest of European Police Systems, Prison Conditions, Private Security, Human Rights and Civil Liberties and the Internal Security Situation in the 1990s. Amsterdam: Domestic Security Research Foundation, 1993.
Cita MLA (8a ed.)Klerks, Peter. The State of Europe: A Digest of European Police Systems, Prison Conditions, Private Security, Human Rights and Civil Liberties and the Internal Security Situation in the 1990s. Domestic Security Research Foundation, 1993.