TY  - BOOK
AU  - Costales, Achilles C.
TI  - Economics: Principles and applications
SN  - 9711110679
AV  - HB 171.5 E36 2003 F 
PY  - 2000///
CY  - Quezon City
PB  - JMC Press, Inc.
KW  - Economics
N1  - Includes index; Bibliography : pp.315-317
ER  -