File:Lakota Map.svg
Sources:
http://2.bp.blogspot.com/-r_VCgymd6fc/UajXhZihrNI/AAAAAAAABRQ/1SV-60r7LEA/s1600/photo.JPG
https://i.redd.it/air5dvsw1he21.jpg
https://farm8.staticflickr.com/7608/16900328526_8daae5a4db_k.jpg
R. E. Asher and Christopher Moseley's Atlas of the World's Languages, 2nd edition, 2007