Seligman's encyclopedia of the social sciences (vol.9 : part 2 : Lefroy - Machine, Political)/ 
by Edwin R A Seligman (ed.) and Alvin Johnson (ed.) 
 - New Delhi:  Cosmo,  2006. 
 - 319-661p. 
<br/><br/><label>ISBN: </label>9788130704906 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Encyclopaedia Social Science<br/>Social Sciences
<br/><br/><label>Dewey Class. No.: </label>300.3  / EDW/S