Sveta, Beograd, 2007. (similar map is published on page number 29) The former Yugoslavia's diverse peoples: a reference sourcebook By Matjaž Klemenčič, Mitja
https://creativecommons.org/licenses/by-sa/4.0CC BY-SA 4.0 Creative Commons Attribution-Share Alike 4.0 truetrue English Eastern Europe in 7-8 centuries