Sheel Kumar <br/><br/>
Paryavaran Samasaya evam Nidan 

 - Delhi  Jyoti Interprises  2006 
 - 375p. 
<br/><br/><label>ISBN: </label>81-902177-7-1 
<br/><br/><label>Dewey Class. No.: </label>363.70954H   She.P6