TY  - BOOK
AU  - Sanford,David H.
TI  - If P, then Q: conditionals and the foundations of reasoning 
SN  - 0415030129 :
U1  - 160 
PY  - 1989///
CY  - London
PB  - Routledge
KW  - Conditionals (Logic)
N1  - Includes bibliographical references and index
ER  -