Emery, Edwin. <br/><br/>
Introduction to mass communications / 
Edwin Emery, Phillip H. Ault, Warren K. Agee. 
 - 4th ed. 
 - New York :  Dodd & Mead,  1973. 
 - 464 p. ;  23 cm. 
<br/><br/>References : p. 418-452. 
<br/><br/><label>ISBN: </label>0396067530 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mass media.