Townsend, Colin R. <br/><br/>
Essentials of ecology / 
Colin R. Townsend, Michael Begon, John L. Harper. 
 - 3rd  ed. 
 - Oxford :  Blackwell,  2008. 
 - xii, 510  p. 
<br/><br/><label>ISBN: </label>1405156585 : 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecology.