TY  - GEN
AU  - Robert ackermann
TI  - Theories of knowledge: A critical introduction
SN  - 3456789109
U1  - 121 ACK 
PY  - 1965///
CY  - Newyork
PB  - Mcgraw-Hill Book Company
KW  - Epistemology
KW  - aristatle
KW  - plato
ER  -