Beasley, Jeffrey S. <br/><br/>
Modern electronic communication / 

 - 9th ed. 
 - USA :  Pearson Education,  c2008. 
 - xxxiii, 950 p. :  ill. ;  25 cm. 
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>9780136154297 
<br/><br/><label>LC Class. No.: </label>D4010 
<br/><br/><label>Dewey Class. No.: </label>621.382  / BEA