Welten, Bernard. “A Brave Police Force Deserves Courageous Scientists After-Dinner Address At Cepol Police Research And Science Conference 2009”. European Law Enforcement Research Bulletin, no. 3 (June 1, 2010): 12-15. Accessed June 17, 2024. https://bulletin.cepol.europa.eu/index.php/bulletin/article/view/26.