Luhmann Niklas <br/><br/>
Social systems 

 - Stanford  Stanford University Press          1995 
 - Iii, 627 p  cm. 
 - Writing Science .
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Sociometry
<br/><br/><label>Dewey Class. No.: </label>Y:(B2893), N5