TY  - BOOK
AU  - Dickoff,James
AU  - James,Patricia
TI  - Symbolic logic and language: a programmed text 
U1  - 164 
PY  - 1965///
CY  - New York
PB  - Mc Graw- Hill Book
KW  - Logic, Symbolic and mathematical
KW  - Programmed instruction
ER  -