TY  - BOOK
AU  - Crossley, John N.
TI  - What is mathematical logic?
U1  - 160 
PY  - 1972/// (1979)
CY  - London, New York
PB  - Oxford University Press
KW  - Logic, Symbolic and mathematical
N1  - Includes bibliographical references (p. [79]) and index
ER  -