Spuler, Bertold 1911-.
The Muslim world a historical survey /
Bertold Spuler ; translated from the German by F. R. C. Bagley 
. - Leiden : E. J. Brill,  1960- 
. - pt.  25 cm. 
<br/> Pt. 1. The age of the Caliphs  <br/>  Pt. 2. The Mongol period  <br/>  <br/>