Shelly, Garry B. <br/><br/>
Business data communications :  introductory concepts and techniques 

 - 2nd ed. 
 - London :  Course Technology,  1998. 
 - (various paging) :  ill. ; 
<br/><br/>Includes index. 
<br/><br/><label>ISBN: </label>0789542870 
<br/><br/><label>LC Class. No.: </label>HF5721  / .Sh3 1998