https://happiness-report.s3.amazonaws.com/2020/WHR20.pdf
http://www.globalcommissionondrugs.org/wp-content/uploads/2018/09/ENG-2018_Regulation_Report_WEB-FINAL.pdf
https://www.npr.org/sections/health-shots/2020/06/22/880803278/how-germany-staffed-up-contact-tracing-teams-to-contain-its-coronavirus-outbreak?t=1602767268883&?ncid=newsltukhpmgpols&t=1602840505295&t=1602841634862
http://www.europarl.europa.eu/pdf/eurobarometre/2018/oneyearbefore2019/eb89_one_year_before_2019_eurobarometer_en_results_annex.pdf