Ruiter, D. W. P. <br/><br/>
Institutional legal facts :  legal powers and their effects / 
Dick W.P. Ruiter. 
 - Dordrecht :  Kluwer Academic,  1993 
 - 238 p. ;  24 cm. 
 - Law and philosophy library ;  v.18 .
<br/><br/>p.231-234 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Legal positivism.<br/>Social institutions.<br/>Effectiveness and validity of law.<br/>Social norms.