TY  - BOOK
AU  - Ayer , A . J
ED  - 
TI  - Problem of Knowledge
U1  - 121 Aye/Pro 
PY  - 1956///
CY  - Harmondsworth
PB  - Penguin Books
KW  - Epistemology ,Causation ,Humankind
N1  - B
ER  -