Shelly Gary B <br/><br/>
Business data communications : introductory concepts and techniques 
Shelly Gary B; Cashman T J And Others 
 - 3 
 - United Kingdom  United Kingdom, Thomson  2001 
 - v . 
<br/><br/><label>ISBN: </label>981-243-110-1 
<br/><br/><label>Source: </label>Textbook