TY  - GEN
AU  - Copi,Irving M.
AU  - Cohen,Carl
TI  - Introduction to logic 
SN  - 0023250356
U1  - 160 
PY  - 1990///
CY  - New York, London
PB  - Macmillan, Collier Macmillan
KW  - Logic
ER  -