Townsend, Colin R. <br/><br/>
Essentials of ecology / 
Colin R. Townsend, Michael Begon, John L. Harper. 
 - 3rd ed. 
 - Malden, MA :  Blackwell Pub.,  2008. 
 - xii, 510 p. :  col. ill., col. maps ;  25 cm 
<br/><br/><label>ISBN: </label>9781405156585 (pbk. : alk. paper) 
<br/><br/><label>Dewey Class. No.: </label>577