Wright, Georg Henrik von <br/><br/>
An essay deontic logic and the general theory of action  with a bibliography of deontic and imperative logic. 

 - Amsterdam  North-Holland Pub. Co.  1968. 
 - 112 p. 
 - Acta Philosophica Fennica, Fasc.XX1 .
<br/><br/>Includes index. Bibliography: p.[97]-107.