IQBAL,S.A. SETHI,M.S. <br/><br/>
ENCYCLOPAEDIA OF NATURE AND ENVIRONMENT 

 - 1st Ed. 
 - New Delhi  Discovery Publishing House, New Delhi   2014 
<br/><br/><label>ISBN: </label>81-7141-392-7 
<br/><br/><label>Dewey Class. No.: </label>550  / SET/E