Mass media research : an introduction  
Wimmer, Roger. D...et al 
 - Canada  Wadsworth  2011 
 -  xii,464p .
<br/><br/> index, ill. 
<br/><br/><label>ISBN: </label>9781439082744 
<br/><br/><label>LC Class. No.: </label>P91.3  / .W47 2011