Ashworth, William; Little, Charles E <br/><br/>
Encyclopedia of environmental studies 

 -  Viva Books Pvt. Ltd., New Delhi  2006 
 - 601 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecology; Biology
<br/><br/><label>Dewey Class. No.: </label>R 574.5  ASH-E