Turkish states in the Middle East, 11th-12th cents. (Western Asia under Timur, c. 1400. [The dominions of] Jingiz Khân 1155... - 1227 and the Mongol empires of the 13th cent.
[Leiden :  E.J. Brill, 
1969]
In: The Muslim World. A historical survey. Part 2. The Mongol period. By B. Spuler. p. 68.