Ecology and Environment / 
P.D.Sharma 
 - 11th. ed. 
 - Boston:  McGraw-Hill,  2012. 
 - iii,642 p. :  ills ;  28 cm. 
<br/><br/><label>ISBN: </label>8171339654 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecology Balance<br/>Environmental Science
<br/><br/><label>Dewey Class. No.: </label>345.6