Math O/ 
Borro, Rogelio M. 
 -  Mutya Publishing House, Inc.  2007 
 - 233 p. ;. 
<br/><br/>
<br/><br/><label>ISBN: </label>978-9-71821104-5 
<br/><br/><label>Dewey Class. No.: </label>F 510 B64m 2007