Gopal, Brij and Bhardwaj, N. <br/><br/>
Elements of Ecology 

 - New Delhi  Vikas Publishing House Pvt Ltd  1979 
 - 200 
<br/><br/><label>ISBN: </label>0706915607 
<br/><br/><label>Publisher. No.: </label> Premier Book Shop 
<br/><br/><label>Subjects--Personal Names: </label> Environmental Science 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Environmental Science