OPEN University of Sri Lanka <br/><br/>
Course of study leading to the degree of bachelor of science level 5 PSU 3119-to 

 - Nugegoda  The Open University of Sri Lanka  1989 
 - 54 p. 
<br/><br/><label>ISBN: </label>123700 
<br/><br/><label>Dewey Class. No.: </label>666.1  / OPE