Sharma PD <br/><br/>
Ecology and Environment .-11th edn .-978-81-7133-965-5 

 - 11th edn  
 -  Rastogi Publication, Meerut, Meerut  2013 
<br/><br/><label>ISBN: </label>978-81-7133-965-5 
<br/><br/><label>Dewey Class. No.: </label>G:5(I)   P13/B27345