Ra'ana, Irfan Mahmud.  <br/><br/>
Economic system under `Umar the Great :   a treatise on Muslim economy in early seventh century / 
Irfan Mahmud Ra'ana. 
 - Lahore :  Sh. Muhammad Ashraf,  c 1970. 
 - xxiii, 152 p. ;  22 cm. 
<br/><br/> Includes index. 
<br/><br/>Bibliography : p. 141-143. 
<br/><br/>336  336 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Muslim economy--7th century.
<br/><br/><label>Dewey Class. No.: </label>330.922 / I1e