Raana, Irfan Mahmud <br/><br/>
Economic system under'Umar the great / 
Irfan Mahmud Ra'ana 
 - 2nd ed. 
 - Lahore :  Sh. Muhammad Ashraf,  1977 
 - xxiv, 165 p. ; 22 cm. 
<br/><br/><label>LCCN: </label>75-932387 
<br/><br/><label>Subjects--Personal Names: </label><br/>'Umar ibn al-Khattab, Caliph,  d. 644 
<br/><br/><label>Subjects--Geographic Terms: </label><br/>India--Economic conditions