TY  - BOOK
AU  - Ackermann, Robert John,
TI  - Modern deductive logic: an introduction to its techniques and si gnificance 
U1  - 162 ACK 
PY  - 1970///
CY  - garden City
PB  - N. Y. Anchor books
KW  - Logic
N1  - Bibliography: p. 231-234
ER  -