OPEN University of Sri Lanka <br/><br/>
Course of study leading to the degree of bachelor of science level 4-CHU 2123-in 

 - Nugegoda  The Open University of Sri Lanka  1996 
 - 109 p. 
<br/><br/><label>ISBN: </label>141624 
<br/><br/><label>Dewey Class. No.: </label>546  / OPE