Verma, P.S. <br/><br/>
Environmental Biology: Principles of Ecology 

 - 1st ed. 
 - New Delhi  S. chand & Company  ltd  2008 
 - viii,  591p.  Paperback  21 cm 
<br/><br/><label>ISBN: </label>9788121908597 
<br/><br/><label>Dewey Class. No.: </label>570