Irfan Mahmud Ra'ana <br/><br/>
Economic system under 'Umar the Great : a treatise on Muslim economy in early seventh century / 
Irfan Mahmud Ra'ana 
 -  Sh. Muhammad Ashraf,  1991 
 - xxiii, 152 pages :  22 cm 
<br/><br/>Includes bibliographical reference (pages 141-143) and index 
<br/><br/><label>ISBN: </label>9694321699 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Islamic Empire -- Economic conditions