TY  - BOOK
AU  - Forbes, Graeme.
TI  - Languages of possibility: an essay in philosophical logic 
T2  - Aristotelian Society series
SN  - 063115941X
U1  - 401 
PY  - 1989///
CY  - New York
PB  - Blackwell
KW  - Modality (Logic).---
ER  -