A Guide for Implementing the Ela Process :   A standard agreed ela procedure based on the gazette ( extra - ordinary) of the democratic socialist republic of Sri Lanka no : 772/ date 24th June 1993,  English. 
Central Environment Authority.  
 - Colombo:  Central Environment Authority,  1993. 
 - [xi], 54 p.:  21cm. 
<br/><br/><label>Dewey Class. No.: </label>X551.588  / EVN