TY  - BOOK
AU  - Chiswell, Ian 
AU  - Hodges, Wilfrid
TI  - Mathematical logic
SN  - 9780199548743
U1  - 511.3 
PY  - 2008///
CY  - New York
PB  - Oxfird University press
KW  - Propositional logic
KW  - Prelude
KW  - Informal natural deduction
ER  -