Books
Nicolle, David.
The Mongol Warlords. Firebird Books, 1990.
Rossabi, Morris. Khubilan
Khan: His Life and Times. University of California Press, 1988.
Ratchnevsky, Paul. Genghis Khan: His Life and Legacy. Blackwell, 1991.
Curtin, Jeremiah. The Mongols: A History. Combined Books, 1996.