Stanley, William D. Jeffords, John M. <br/><br/>
Electronic communications  : principles and systems 
/by William D.Stanley, John M.Jeffords 
 - Canada  Delmar Cengage Learning  2008 
 - xviii, 702 p. 
<br/><br/><label>ISBN: </label>8131503546 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electronic communications
<br/><br/><label>Dewey Class. No.: </label>621.381  / STA