TY  - BOOK
AU  - Copi, Irving M.
AU  - Cohen Carl
TI  - Introduction to logic
SN  - 0023250410
AV  - BC 108 .C69 1994 
PY  - 1994///
CY  - New York
PB  - Macmillan pubilishing company
KW  - Introduction  to logic
ER  -