TY  - GEN
AU  - Copi, Irving M.
AU  - Cohen, Carl
TI  - Introduction to logic
SN  - 0131898345
AV  - BC108.COP 2005 
PY  - 2005///
CY  - New Jersey
PB  - Pearson Prentice Hall
KW  - Logic-
KW  - Textbooks
N1  - Includes Index and bibliographical references
ER  -