ECOTAR 
Ma. Ruby Anne Maroma Liwanag ... [et.al.]. 
 - revised edition. 
 -  Books Atbp. Publishing Corp.  2014 
 - viii, 278 pages 
Economics -- Study and teaching -- Philippines.
F 330.44 E1991 2014
                        Economics -- Study and teaching -- Philippines.
F 330.44 E1991 2014