Fang, Irving E. <br/><br/>
A history of mass communication  six information revolutions 
Irving Fang 
 - Boston  Focal Press  1997 
 - 280 p. : ill. ; 26 cm. 
<br/><br/>p. 244-254. 
<br/><br/><label>ISBN: </label>0240802543  RM92.26 
<br/><br/><label>LCCN: </label>96-36527 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Communication--History