TY  - BOOK
AU  -  Copi , Irving M.
AU  -  Cohen, Carl.
TI  - Introduction to logic : 
SN  - 0023250356 ;9780023250354 ;9780029461921;0029461928 
U1  - 181.4 
PY  - 1990///
CY  - New York
PB  - Macmillan
KW  - Logic
N1  - Include index
ER  -