Communication technology update / 
August E. Grant, editor 
 - 4th ed. 
 - Boston :  Focal Press,  1995 
 - 428 p. : ill. ; 28 cm. 
<br/><br/><label>ISBN: </label>0240802381  RM122.38 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Communication--Technological innovations