| and Roger Savory, Introduction to Islamic civilisation, Cambridge University Press, 1976 , 82 | |
|---|---|
| Black, Edwin, Banking on Baghdad: inside Iraq's 7,000-year history of war, profit and conflict, John Wiley and sons, 2004 , 38 | Grousset, Rene, The Empire of the Steppes, New Brunswick:Rutgers University Press, 1988 ,159,161 |
.
30.
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