Halperin, Charles J. (1985). „Economic and Demographic Consequences”. Russia and the Golden Horde: The Mongol Impact on Medieval Russian History. History Russian studies. Bloomington: Indiana University Press (објављено 1987). стр. 78. ISBN9780253204455. Приступљено 17. 5. 2021. „The Russian peasantry felt the Tatars' economic oppression much more than the Russian aristocracy and indeed the Russian princes profited from the exploitation of their people. The grand princes were in charge of collecting tribute for the Mongols, and this proved so profitable that the throne was more than worth the large bribes the khan required before awarding it.”CS1 одржавање: Формат датума (веза)
Uspensky, Gleb (1993). The Insider's Guide to Russia. Insiders' Guide Travel Series. Hunter Publishing. стр. 44. ISBN9781556505584. Приступљено 17. 5. 2021. „[...] Russia [...] in 1480, stopped paying tribute to the now-shaky and fragmented Golden Horde.”CS1 одржавање: Формат датума (веза)
Histoire Russe. University Center for International Studies, University of Pittsburgh. 1992. стр. 11. Приступљено 17. 5. 2021. „The marriages of Rus' princes to the daughters of the Polovtsy khans [...].”CS1 одржавање: Формат датума (веза)
Gutleb, Bernhard; Ziaie, Hooshang (1999). „On the distribution and status of the Brown Bear,Ursus arctos, and the Asiatic Black Bear, U. thibetanus, in Iran”. Zoology in the Middle East. 18: 5—8. doi:10.1080/09397140.1999.10637777.
