Raya IV 
Agcaoili, Aurelio S. 
 -  C & E Publishing, Inc.  2005 
 - 432 pages. 
<br/><br/>
<br/><br/><label>ISBN: </label>9-71584369-7 
<br/><br/><label>Dewey Class. No.: </label>HS 899.211 A264 2005