R.C. Saxena, <br/><br/>
Encyclopedia of Social Science in 21st century :   volume 2(E to O) /  
By R.C. Saxena .  
 - 1st ed /   vol.3. 
 - Jaipur:  Shree Niwas Publication,  2012. 
 - 566p. 
<br/><br/><label>ISBN: </label>9789350320075 
<br/><br/><label>Subjects--Index Terms: </label>Social sciences Encyclopedia 
<br/><br/><label>Dewey Class. No.: </label>300.03