Hansen, Anders et al. <br/><br/>
Mass communication Research Methods 

 - LoNew Delhion  Macmillan Press  1998 
 - viii,350p.  23 cm. 
<br/><br/><label>ISBN: </label>033361710X 
<br/><br/><label>Dewey Class. No.: </label>302.23072  / MAS