found: Zolotai︠a︡ Orda, 2012:t.p. verso (Berke) p. 312 (Berke Khan)
found: Sanders, A. Historical Dictionary of Mongolia, 2010:p. xxxii (1266 Berke Khan of the Golden Horde died)
found: Munis Khorezmi. Firdaws Al-iqbāl: History of Khorezm, 1999:p. 22 (Berke Khan ibn Jochi Khan, d. in 664 A.H. [1265/1266])
found: Conflict and Conquest in the Islamic World: A Historical Encyclopedia, 2011:p. 211 (Berke Khan (d. 1266)
found: Spuler, B. The Muslim world, 1969:v. 1 p. 47 (Berke, Khan of the Golden Horde from 1257 to 1267)
found: History and Historiography of Post-Mongol Central Asia and the Middle East, 2006:p. 193 (Khan of the Golden Horde Berke (r. 1257-67))
found: Museum of Money of Feodosia (http://en.museum-of-money.org/view/berke_khan_ah_655_665_1257_1266/ viewed 27 Feb. 2013):(BERKE KHAN. AH 655 665 / 1257 -1266. Berke Khan (Бэрх хаан in Mongolian, also بركة خان) was the ruler of the Ulus of Jochi (or Golden Horde) who effectively consolidated the power of the Blue Horde and White Hordes from 1257 to 1266)
found: Bostancı, F. Berke Han dönemi Altın Orda devleti tarihi (1256 - 1266), 2021:t.p. (Berke Han)
found: Wikipedia, 12 Sept 2023:(Berke Khan; d. 1266; also Birkai; Mongolian: Бэрх хан, Tatar: Бәркә хан; was a grandson of Genghis Khan and a Mongol military commander and ruler of the Golden Horde (division of the Mongol Empire) who effectively consolidated the power of the Blue Horde and White Horde[note 2] from 1257 to 1266. He succeeded his brother Batu Khan of the Blue Horde (West), and was responsible for the first official establishment of Islam in a khanate of the Mongol Empire)
