ECOTAR 
Ma. Ruby Anne Maroma Liwanag ... [et.al.]. 
 - revised edition. 
 -  Books Atbp. Publishing Corp.  2014 
 - viii, 278 pages 
<br/><br/>
<br/><br/><label>Subjects--Topical Terms: </label><br/>Economics -- Study and teaching -- Philippines.
<br/><br/><label>Dewey Class. No.: </label>F 330.44 E1991 2014