TY  - BOOK
AU  - Copi, Irving M.
AU  - Cohen, Carl
TI  - Introduction to logic
SN  - 81-7808-486-4
U1  - 160 
PY  - 2001///
CY  - New Delhi
PB  - Prentice-Hall of India
KW  - Logic
N1  - Includes index
ER  -