OPEN University of Sri Lanka <br/><br/>
Course of study leading to the degree of bachelor of science level 5 PSU 3123, b 

 - Nugegoda  The Open University of Sri Lanka  1991 
 - 90 p. 
<br/><br/><label>ISBN: </label>123734 
<br/><br/><label>Dewey Class. No.: </label>574.192  / OPE