Hiebert, Ray Eldon <br/><br/>
Mass media VI  an introduction to modern communication 
Ray Eldon Hiebert, Donald F. Ungurait, Thomas W. Bohn 
 - New York  Longman  1990 
 - xix, 666 p. : ill. ; 26 cm. 
<br/><br/>p. 641-648 
<br/><br/><label>ISBN: </label>0801304539 
<br/><br/><label>LCCN: </label>90-013463 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mass media<br/>Communication