Abu Bakr :  The first caliph 

 - U.K.  The Islamic Foundation  1986 
 - p.44 
<br/><br/><label>ISBN: </label>0950395447 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Islam--Abu Bakr
<br/><br/><label>Dewey Class. No.: </label>297.64  / ABU