Ross, Alf,  1899- <br/><br/>
Directives and norms / 
[manuscript by Brian Loar]. 
 - London :  Routledge & K. Paul,  1968. 
 - ix, 188 p. ;  23 cm. 
 - International library of philosophy and scientific method. .
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>710036353 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Semantics (Philosophy)<br/>Logic.<br/>Law--Philosophy.
<br/><br/><label>Dewey Class. No.: </label>149.94