
https://www.transparency.de/fileadmin/Redaktion/Publikationen/2019/19-09-01_TI-D_Gutachten_Momsen.pdf

https://www.gallup.com/analytics/694904/what-is-law-order-index.aspx

http://www.globalcommissionondrugs.org/wp-content/uploads/2018/09/ENG-2018_Regulation_Report_WEB-FINAL.pdf