"Genghis Khan & the Mongol Conquests 1190–1400", Osprey Publishing.
*Strakosch-Grassmann, "Einfall der Mongolen in Mittel-Europa 1241-1242", Innsbruck, 1893*Thackston, W.M., "Rashiduddin Fazlullah’s Jamiʻuʾt-tawarikh (Compendium of Chronicles)", Harvard University, Department of Near Eastern Languages and Civilizations, 1998-99*Turnbull, Stephen,(2003).