OPEN University of Sri Lanka <br/><br/>
Course of study leading to the degree of bachelor of science level 2-foundation 

 - Nugegoda  The Open University of Sri Lanka  1986 
 - 63 p. 
<br/><br/><label>ISBN: </label>139467 
<br/><br/><label>Dewey Class. No.: </label>534  / OPE