Raana, Irfan Mahmud <br/><br/>
Economic system under Umar the Great :  a treatise on Muslim economy in early seventh century / 
by Irfan Mahmud Raana 
 - Lahore :  Sh. Muhammad Ashraf,  1970 
 - 152 p. ;  19 cm. 
<br/><br/><label>Subjects--Personal Names: </label><br/>'Umar ibn al-Khattab, Caliph,  d. 644 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Economics--Religious aspects--Islam