"Yapa, S.T.W.S." <br/><br/>
ව්‍යාපාර ගණිතය/ 
S.T.W.S. Yapa 
 - Nugegoda:  "Yapa,"  2001 
 - 181p. 
<br/><br/><label>Subjects--Index Terms: </label>business mathematics 
<br/><br/><label>Dewey Class. No.: </label>310