Wimmer, Roger D. <br/><br/>
Mass media research :  an introduction / 
Roger D. Wimmer, Joseph R. Dominick. 
 - 2nd ed. 
 - Belmont, Calif. :  Wadsworth Pub. Co.,  c1987. 
 - xiv, 514 p. :  ill. ;  25 cm. +  1 instructor's manual (58 p. ; 22 cm.)