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

 - 5th ed. 
 - New Delhi:  PHI Learning,  2013. 
 - xvii,590p. 
<br/><br/><label>ISBN: </label>9788120347861 
<br/><br/><label>Dewey Class. No.: </label>628  / RAN.E