Luhmann, Niklas. <br/><br/>
Ecological communication /Niklas Luhmann, Tr. by John Bednarz 

 - Chicago  Univ. of Chicago Pr.  1989 
 - xviii, 187p 
<br/><br/><label>ISBN: </label>0226496511 
<br/><br/><label>Dewey Class. No.: </label>574.501  / N89