TY  - BOOK
AU  - Cruz,Corazon L.
TI  - Introduction to logic
SN  - 9710857975
U1  - 160  Fourth edition 
PY  - 1995///
CY  - Mandaluyong
PB  - National Book Store
KW  - Logic
KW  - Problems, exercises, etc
KW  - Study and teaching
N1  - Bibliography: page 359.
ER  -