Suriyakumaran <br/><br/>
The Methodology of enviroment management 
C.Suriyakumaran 
 - Sri lanka  A crods special publication  1993 
 - 250 
<br/><br/><label>ISBN: </label>9559558102 
<br/><br/><label>Dewey Class. No.: </label>352.6  / SUR