"Global Peace Index"(PDF). visionofhumanity.org. Institute for Economics and Peace. Archived from the original(PDF) on 27 August 2019. Retrieved 1 September 2021.
"Global Peace Index"(PDF). visionofhumanity.org. Institute for Economics and Peace. Archived from the original(PDF) on 27 August 2019. Retrieved 1 September 2021.