Halperin, Charles J.: Russia and the Golden Horde: The Mongol Impact on Medieval Russian History, 1987. ISBN 9781850430575. (e-kirja). (1985 verkkojulkaisu) ss. 113-115
Ostrowski, Donald G. : "Encyclopedia of Mongolia and the Mongol Empire, and: The Mongols and the West, 1221–1410, and: Daily Life in the Mongol Empire, and: The Secret History of the Mongols: A Mongolian Epic Chronicle of the Thirteenth Century (review)". Kritika: Explorations in Russian and Eurasian History. Project MUSE, 2007. 8 (2): ss. 431–441. doi:10.1353/kri.2007.0019. S2CID 161222967.
jstor.org
[tähän olisi hyvä lähde, mutta se on maksullinen] Schurmann, H. F.: Mongolian Tributary Practices of the Thirteenth Century.Harvard Journal of Asiatic Studies Vol. 19, No. 3/4. Ss. 304-389. Harvard-Yenching Institute, joulukuu 1956.
Ostrowski, Donald G. : "Encyclopedia of Mongolia and the Mongol Empire, and: The Mongols and the West, 1221–1410, and: Daily Life in the Mongol Empire, and: The Secret History of the Mongols: A Mongolian Epic Chronicle of the Thirteenth Century (review)". Kritika: Explorations in Russian and Eurasian History. Project MUSE, 2007. 8 (2): ss. 431–441. doi:10.1353/kri.2007.0019. S2CID 161222967.
