TY  - BOOK
AU  - Agapay, Ramon B.
TI  - Logic : : the essentials of deductive reasoning 
SN  - 9710868578
U1  - FIL 160 Ag1l 2007 
PY  - 2007///
CY  - Mandaluyong City : 
PB  - National Book Store, 
KW  - Logic.
N1  - Bibliography: page 180
ER  -