TY  - BOOK
AU  - Copi, Irving M
AU  - Cohen, Carl
TI  - Introduction to logic 
SN  - 81-203-0942-1
U1  - 160 
PY  - 1999///
CY  - New Delhi
PB  - Prentice Hall
KW  - Logic
N1  - Includes index
ER  -