TY  - BOOK
AU  - Churchill, Robert Paul
TI  - Logic : : an introduction / 
SN  - 0-312-02353-7
U1  - DC 160 1990
PY  - 1990///
CY  - New York : 
PB  - St. Martin's Press, 
KW  - Logic
N1  - Includes bibliographical references and index
ER  -