Shelly,gary b / cashman, thomas j /pratt,philip j  <br/><br/>
Business data communications : introductory concepts and techniques  

 - 2nd ed. 
 - Prentice hall  
<br/><br/><label>ISBN: </label>0133484831 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Data trasmission systems  2.  Computer networks 
<br/><br/><label>Dewey Class. No.: </label>004.6 SHE