Rana, S.V.S.    <br/><br/>
Essentials of ecology and environmental science.  

 - 4th ed. 
 - New Delhi.  PHI Learning.   2010. 
 - 542. 
<br/><br/>index: 559-568.Biplio: 
<br/><br/><label>ISBN: </label>9788120338944 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecology. Environment.
<br/><br/><label>Dewey Class. No.: </label>574.5/R185e