TY  - BOOK
AU  - Gustason, William 
AU  - Ulrich, Dolph E. 
TI  - Elementary Symbolic Logic 
AV  - BC 135 .G87 1989  
PY  - 1989///
CY  - Long grove 
PB  - Waveland Press, INC.
KW  - Logic, symbolic and mathematical
ER  -