Aziz, Maulvi Abdul <br/><br/>
History of Islam 2(caliphates): Umar Ibn Al-khattab  English 

 - Darussalam  2012 
 - 141 
 -  9786035000772 .
<br/><br/><label>ISBN: </label>9786035000772 
<br/><br/><label>Dewey Class. No.: </label>297