| title | author | publisher | year | language | bookcover |
|---|---|---|---|---|---|
| Rules of Acceptance and Inductive Logic | Risto Hilpinen | North-Holland publishing Company | 1968 | Acta Philosphica Fennica - Fasc. XXII |  |
| title | author | publisher | year | language | hardcover | isbn |
|---|---|---|---|---|---|---|
| DEONTIC LOGIC: INTRODUCTORY AND SYSTEMATIC READINGS | EDITED BY RISTO HILPINEN | D.REIDEL PUBLISHING COMPANY/ DORDRECHT | 1971 | ENGLISH | x | 9027701679 |