Rana,S.V.S. <br/><br/>
Essentials of ecology and environmental science /  
S.V.S. Rana 
 - 5th ed. 
 - New delhi :  PHI Learning  c2013 
 - xv, 590 p. :  ill. ;  24 cm. 
<br/><br/> Includes Index. 
<br/><br/><label>ISBN: </label>9788120347861 9788120327733 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecology.
<br/><br/><label>Dewey Class. No.: </label>624  / RAE