Young,  Paul H. <br/><br/>
Electronic communication techniques 

 -  Merrill  c1991 
<br/><br/> Includes index. 
<br/><br/><label>Nat. Bib. Agency Control No.: </label> 0029463122 
<br/><br/><label>Dewey Class. No.: </label>621.382 Yo7